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<!---->
<li class="nav-bar-item">
<a data-test-id="header-link-q&a" class=" nav-bar-button has-hover-underline " href="/en-us/answers/" data-bi-name="L1-navigation-link">
<span><!---->Q&A<!----></span>
</a>
</li>
<!---->
<li class="nav-bar-item">
<a data-test-id="header-link-code-samples" class=" nav-bar-button has-hover-underline " href="/en-us/samples/browse/" data-bi-name="L1-navigation-link">
<span><!---->Code Samples<!----></span>
</a>
</li>
<!---->
<li class="nav-bar-item">
<a data-test-id="header-link-assessments" class=" nav-bar-button has-hover-underline " href="/en-us/assessments/" data-bi-name="L1-navigation-link">
<span><!---->Assessments<!----></span>
</a>
</li>
<!---->
<li class="nav-bar-item">
<a data-test-id="header-link-shows" class=" nav-bar-button has-hover-underline " href="/en-us/shows/" data-bi-name="L1-navigation-link">
<span><!---->Shows<!----></span>
</a>
</li>
<!---->
<li class="nav-bar-item">
<a data-test-id="header-link-events" class=" nav-bar-button has-hover-underline " href="/en-us/events/" data-bi-name="L1-navigation-link">
<span><!---->Events<!----></span>
</a>
</li>
<!----> <li class="dropdown nav-bar-item" hidden="">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button has-hover-underline" aria-controls="ax-86" data-bi-name="L1-navigation-menu" value="undefined">
<span><!---->More<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-down-light expanded-indicator"></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-86" aria-label="More">
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button is-active" href="/en-us/docs/" aria-current="true" data-bi-name="L1-navigation-link">
Documentation
</a>
</li>
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button " href="/en-us/training/" data-bi-name="L1-navigation-link">
Training
</a>
</li>
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button " href="/en-us/certifications/" data-bi-name="L1-navigation-link">
Certifications
</a>
</li>
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button " href="/en-us/answers/" data-bi-name="L1-navigation-link">
Q&A
</a>
</li>
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button " href="/en-us/samples/browse/" data-bi-name="L1-navigation-link">
Code Samples
</a>
</li>
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button " href="/en-us/assessments/" data-bi-name="L1-navigation-link">
Assessments
</a>
</li>
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button " href="/en-us/shows/" data-bi-name="L1-navigation-link">
Shows
</a>
</li>
<!---->
<li class="nav-bar-item" hidden="">
<a class=" nav-bar-button " href="/en-us/events/" data-bi-name="L1-navigation-link">
Events
</a>
</li>
<!---->
</ul>
</li><!---->
</ul>
</nav>
<span class="nav-bar-spacer"></span>
<div class="nav-bar-search " id="ax-87" hidden="">
<form class="nav-bar-search-form" method="GET" name="nav-bar-search-form" role="search" id="nav-bar-search-form" aria-label="Search" action="/en-us/search/">
<div class="autocomplete" data-bi-name="autocomplete"><!---->
<div class="field-body control ">
<input role="combobox" maxlength="100" aria-autocomplete="list" autocapitalize="none" autocomplete="off" autocorrect="off" spellcheck="false" id="site-search-input" data-test-id="site-search-input" class="autocomplete-input input input-sm
" type="search" name="terms" aria-expanded="false" aria-owns="ax-88-listbox" aria-controls="ax-88-listbox" aria-activedescendant="" aria-label="Search" aria-describedby="ms--site-search-input-description" placeholder="Search" pattern=".*">
<span aria-hidden="true" class="icon is-small is-left" hidden="">
<span class="has-text-primary docon docon-undefined"></span>
</span>
<span aria-hidden="true" class="autocomplete-loader loader has-text-primary " hidden=""></span>
<span id="ms--site-search-input-description" hidden="">
Suggestions will filter as you type
</span>
</div>
<ul role="listbox" id="ax-88-listbox" data-test-id="site-search-input-listbox" class="autocomplete-suggestions is-vertically-scrollable padding-xs " aria-label="Suggestions" hidden="">
</ul>
<!----></div>
<!-- mobile safari will not dispatch submit event unless there's a submit button that is not display:none -->
<button type="submit" class="visually-hidden" tabindex="-1" aria-hidden="true"></button>
<input name="category" value="" hidden="">
<input name="scope" value="Exchange Support" hidden="">
</form>
</div>
<div class="nav-bar-search">
<!-- hidden when the width drops to tablet -->
<form class="nav-bar-search-form" method="GET" name="nav-bar-search-form" role="search" id="nav-bar-search-form-desktop" aria-label="Search" action="/en-us/search/">
<div class="autocomplete" data-bi-name="autocomplete"><!---->
<div class="field-body control has-icons-left">
<input role="combobox" maxlength="100" aria-autocomplete="list" autocapitalize="none" autocomplete="off" autocorrect="off" spellcheck="false" id="site-search-input-desktop" data-test-id="site-search-input-desktop" class="autocomplete-input input input-sm
control has-icons-left
" type="search" name="terms" aria-expanded="false" aria-owns="ax-89-listbox" aria-controls="ax-89-listbox" aria-activedescendant="" aria-label="Search" aria-describedby="ms--site-search-input-desktop-description" placeholder="Search" pattern=".*">
<span aria-hidden="true" class="icon is-small is-left">
<span class="has-text-primary docon docon-search"></span>
</span>
<span aria-hidden="true" class="autocomplete-loader loader has-text-primary " hidden=""></span>
<span id="ms--site-search-input-desktop-description" hidden="">
Suggestions will filter as you type
</span>
</div>
<ul role="listbox" id="ax-89-listbox" data-test-id="site-search-input-desktop-listbox" class="autocomplete-suggestions is-vertically-scrollable padding-xs " aria-label="Suggestions" hidden="">
</ul>
<!----></div>
<!-- mobile safari will not dispatch submit event unless there's a submit button that is not display:none -->
<button type="submit" class="visually-hidden" tabindex="-1" aria-hidden="true"></button>
<input name="category" value="" hidden="">
<input name="scope" value="Exchange Support" hidden="">
</form>
</div>
<div class="nav-bar-search " hidden="">
<div class="nav-bar-search-form-expander">
<button id="form-expander" data-test-id="form-expander" class="nav-bar-button has-hover-underline " title="Search" aria-expanded="false" aria-controls="ax-87">
<span class="is-visually-hidden-mobile"><!---->Search<!----></span>
<span class="icon margin-left-xxs" aria-hidden="true">
<span class="docon docon-search"></span>
</span>
</button>
</div>
</div>
<div class="nav-bar-profile">
<a class="docs-sign-in auth-status-determined not-authenticated" href="#"> Sign in </a>
<div class="dropdown has-caret auth-status-determined authenticated">
<button class="dropdown-trigger button-reset" aria-controls="user-menu" aria-expanded="false" data-bi-name="L1-user-menu" aria-label="Your Account">
<figure class="image is-36x36">
<img class="has-body-background-medium border-radius-rounded" alt="" data-profile-property="avatarUrl">
</figure>
</button>
<div class="dropdown-menu box justify-content-flex-start has-body-background" id="user-menu" data-bi-name="user-menu" role="menu">
<div class="media is-user-dir">
<div class="media-left">
<figure class="image is-48x48" aria-hidden="true">
<img class="has-body-background-medium border-radius-rounded" aria-labelledby="displayName" alt="" data-profile-property="avatarUrl">
</figure>
</div>
<div class="media-content">
<h2 class="title font-size-lg">
<span id="displayName" class="is-inline-truncated has-max-width-200" data-profile-property="displayName"></span>
</h2>
<p class="subtitle font-size-sm margin-bottom-none">
<span class="is-inline-truncated has-max-width-200" data-profile-property="upn"></span>
</p>
</div>
</div>
<ul class="padding-top-xs padding-bottom-xs">
<li class="padding-bottom-xs">
<a data-profile-property="profileUrl" href="https://learn.microsoft.com/en-us/users/me/activity/"><!---->Profile<!----></a>
</li>
<li>
<a data-profile-property="settingsUrl" href="https://learn.microsoft.com/en-us/users/me/settings/"><!---->Settings<!----></a>
</li>
</ul>
<div class="border-top padding-top-xs">
<a class="docs-sign-out" href="#"><!---->Sign out<!----></a>
</div>
</div>
</div>
</div>
<!----></div> <div class="nav-bar border-top is-hidden-mobile" data-test-id="secondary-nav-bar" data-bi-name="L2-header"><!---->
<a class="nav-bar-button is-title has-hover-underline" itemprop="url" data-bi-name="L2-category-link" href="/en-us/microsoft-365/">
<span>
Microsoft 365
</span>
</a>
<nav class="nav-bar-nav" role="navigation" aria-label="Site">
<ul class="nav-bar-nav-list">
<!----> <li class="dropdown nav-bar-item">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button has-hover-underline" aria-controls="ax-90" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Solutions and architecture<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-down-light expanded-indicator"></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-90" aria-label="Solutions and architecture">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/solution-architecture-center" data-bi-name="L2-navigation-link">
Get started
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/empower-people-to-work-remotely" data-bi-name="L2-navigation-link">
Set up your infrastructure for hybrid work
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/setup-secure-collaboration-with-teams" data-bi-name="L2-navigation-link">
Set up secure collaboration
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/deploy-threat-protection" data-bi-name="L2-navigation-link">
Deploy threat protection
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/data-privacy-protection" data-bi-name="L2-navigation-link">
Data privacy and data protection
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/campaigns/" data-bi-name="L2-navigation-link">
Microsoft 365 for smaller businesses and campaigns
</a>
</li>
<!---->
</ul>
</li><!----> <li class="dropdown nav-bar-item">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button has-hover-underline" aria-controls="ax-91" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Apps and services<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-down-light expanded-indicator"></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-91" aria-label="Apps and services">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/MicrosoftTeams" data-bi-name="L2-navigation-link">
Microsoft Teams
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/admin/" data-bi-name="L2-navigation-link">
Microsoft 365 admin center
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/DeployOffice" data-bi-name="L2-navigation-link">
Microsoft 365 Apps
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/compliance/" data-bi-name="L2-navigation-link">
Microsoft Purview
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/security/" data-bi-name="L2-navigation-link">
Microsoft 365 security
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/sharepoint" data-bi-name="L2-navigation-link">
SharePoint
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/onedrive" data-bi-name="L2-navigation-link">
OneDrive
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365" data-bi-name="L2-navigation-link">
All apps and services
</a>
</li>
<!---->
</ul>
</li><!----> <li class="dropdown nav-bar-item">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button has-hover-underline" aria-controls="ax-92" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Training<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-down-light expanded-indicator"></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-92" aria-label="Training">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/training/m365/" data-bi-name="L2-navigation-link">
Training for IT Pros
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/certifications/browse/?products=m365" data-bi-name="L2-navigation-link">
Microsoft 365 certifications
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/office365/customlearning/" data-bi-name="L2-navigation-link">
Microsoft 365 learning pathways
</a>
</li>
<!---->
</ul>
</li><!----> <li class="dropdown nav-bar-item">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button has-hover-underline" aria-controls="ax-93" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Resources<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-down-light expanded-indicator"></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-93" aria-label="Resources">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="https://support.microsoft.com/microsoft-365" data-bi-name="L2-navigation-link">
Microsoft 365 support
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="https://www.microsoft.com/fasttrack/microsoft-365" data-bi-name="L2-navigation-link">
FastTrack
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/office/troubleshoot" data-bi-name="L2-navigation-link">
Troubleshooting
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="https://techcommunity.microsoft.com/t5/Microsoft-365/ct-p/microsoft365" data-bi-name="L2-navigation-link">
Microsoft 365 tech community
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="https://developer.microsoft.com/microsoft-365" data-bi-name="L2-navigation-link">
Resources for developers
</a>
</li>
<!---->
</ul>
</li><!----> <li class="dropdown nav-bar-item" hidden="">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button has-hover-underline" aria-controls="ax-94" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->More<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-down-light expanded-indicator"></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-94" aria-label="More">
<!----> <li class="dropdown nav-bar-item" hidden="">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button " aria-controls="ax-95" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Solutions and architecture<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-right-light "></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-95" aria-label="Solutions and architecture">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/solution-architecture-center" data-bi-name="L2-navigation-link">
Get started
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/empower-people-to-work-remotely" data-bi-name="L2-navigation-link">
Set up your infrastructure for hybrid work
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/setup-secure-collaboration-with-teams" data-bi-name="L2-navigation-link">
Set up secure collaboration
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/deploy-threat-protection" data-bi-name="L2-navigation-link">
Deploy threat protection
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/solutions/data-privacy-protection" data-bi-name="L2-navigation-link">
Data privacy and data protection
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/campaigns/" data-bi-name="L2-navigation-link">
Microsoft 365 for smaller businesses and campaigns
</a>
</li>
<!---->
</ul>
</li><!----> <li class="dropdown nav-bar-item" hidden="">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button " aria-controls="ax-96" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Apps and services<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-right-light "></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-96" aria-label="Apps and services">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/MicrosoftTeams" data-bi-name="L2-navigation-link">
Microsoft Teams
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/admin/" data-bi-name="L2-navigation-link">
Microsoft 365 admin center
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/DeployOffice" data-bi-name="L2-navigation-link">
Microsoft 365 Apps
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/compliance/" data-bi-name="L2-navigation-link">
Microsoft Purview
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365/security/" data-bi-name="L2-navigation-link">
Microsoft 365 security
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/sharepoint" data-bi-name="L2-navigation-link">
SharePoint
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/onedrive" data-bi-name="L2-navigation-link">
OneDrive
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/microsoft-365" data-bi-name="L2-navigation-link">
All apps and services
</a>
</li>
<!---->
</ul>
</li><!----> <li class="dropdown nav-bar-item" hidden="">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button " aria-controls="ax-97" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Training<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-right-light "></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-97" aria-label="Training">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/training/m365/" data-bi-name="L2-navigation-link">
Training for IT Pros
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/certifications/browse/?products=m365" data-bi-name="L2-navigation-link">
Microsoft 365 certifications
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/office365/customlearning/" data-bi-name="L2-navigation-link">
Microsoft 365 learning pathways
</a>
</li>
<!---->
</ul>
</li><!----> <li class="dropdown nav-bar-item" hidden="">
<button aria-expanded="false" class="dropdown-trigger nav-bar-button " aria-controls="ax-98" data-bi-name="L2-navigation-menu" value="undefined">
<span><!---->Resources<!----></span>
<span class="nav-bar-button-chevron" aria-hidden="true">
<span class="docon docon-chevron-right-light "></span>
</span>
</button>
<ul class="dropdown-menu" id="ax-98" aria-label="Resources">
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="https://support.microsoft.com/microsoft-365" data-bi-name="L2-navigation-link">
Microsoft 365 support
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="https://www.microsoft.com/fasttrack/microsoft-365" data-bi-name="L2-navigation-link">
FastTrack
</a>
</li>
<!---->
<li class="nav-bar-item">
<a class="has-external-link-indicator nav-bar-button " href="/en-us/office/troubleshoot" data-bi-name="L2-navigation-link">
Troubleshooting
</a>
</li>
<!---->
<li class="nav-bar-item">
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<!----></div></form><ul class="tree table-of-contents is-vertically-scrollable flex-grow-1 flex-shrink-1" role="tree" aria-label="Table of contents" data-bi-name="tree" data-is-collapsible="true"><li role="none"><a aria-setsize="15" aria-level="1" aria-posinset="1" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/exchange-online-welcome">Exchange Online Troubleshooting</a></li><li class="tree-item" aria-setsize="15" aria-level="1" aria-posinset="2" role="treeitem" tabindex="-1" id="title-2-1" aria-expanded="false"><span data-bi-name="tree-expander" class="tree-expander"><span class="tree-expander-indicator docon docon-chevron-right-light" aria-hidden="true"></span>Administration</span></li><li class="tree-item" aria-setsize="15" aria-level="1" aria-posinset="3" role="treeitem" tabindex="-1" id="title-3-1" aria-expanded="false"><span data-bi-name="tree-expander" 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class="tree-expander-indicator docon docon-chevron-right-light" aria-hidden="true"></span>Email Alias</span></li><li class="tree-item is-expanded" aria-setsize="15" aria-level="1" aria-posinset="7" role="treeitem" tabindex="-1" id="title-7-1" aria-expanded="true"><span data-bi-name="tree-expander" class="tree-expander"><span class="tree-expander-indicator docon docon-chevron-right-light" aria-hidden="true"></span>Email Delivery</span><ul class="tree-group" role="group"><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="1" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/administrative-limit-for-this-request-was-exceeded-error">Administrative limit for this request was exceeded error</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="2" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/autoforward-mail-exclusions-not-honored-transport-rule">Automatically forward email in transport rule</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="3" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/transport-rule-not-created-because-too-large">Can't create too large transport rules</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="4" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/cannot-validate-outbound-connector">Can't validate an outbound connector</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="5" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/configure-proofpoint-with-exchange">Configure Proofpoint Email Protection with Exchange Online</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="6" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/custom-messages-replaced-by-default-system-messages">Custom messages are replaced by default system messages</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="7" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/delivery-receipts-are-not-generated">Delivery receipts aren't generated for messages sent to external</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="8" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/wrong-office-365-region-exo">Email sent to EXO deferred with ATTR35</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="9" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/emails-not-received-for-new-domain">Emails aren't received for a new domain</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="10" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/send-receive-emails-socketerror">Errors when sending/receiving emails</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="11" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/external-recipients-not-receiving-distribution-group-emails">External recipients can't get distribution group emails</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="12" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/email-delivery-issues">Find and fix email delivery issues</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="13" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/how-to-block-message-from-being-sent-or-received">How to block message send or receive</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="14" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/imceaex-ndr">IMCEAEX non-delivery report</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="15" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/office-365-notice">Important notice for Microsoft 365</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="16" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/inbox-rule-to-forward-messages-not-work">Inbox rule to forward emails doesn't work</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="17" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/inbox-redirect-rule-not-working">Inbox redirection rule not working</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="18" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/fix-issues-with-printers-scanners-and-lob-applications-that-send-email-using-off">Issues with printers, scanners, and LOB apps that send email</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="19" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/property-length-too-long-error">Length of the property is too long</a></li><li role="none"><a aria-setsize="21" aria-level="2" aria-posinset="20" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/messages-with-attachments-are-not-delivered">Messages with attachments not delivered</a></li><li class="tree-item is-expanded" aria-setsize="21" aria-level="2" aria-posinset="21" role="treeitem" tabindex="-1" id="title-7-1_21-2" aria-expanded="true"><span data-bi-name="tree-expander" class="tree-expander"><span class="tree-expander-indicator docon docon-chevron-right-light" aria-hidden="true"></span>Non-delivery report (NDR)</span><ul class="tree-group" role="group"><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="1" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/non-delivery-reports-in-exchange-online">NDR and SMTP errors</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="2" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-451-4-7-500-699-asxxx-in-exchange-online">451 4.7.500-699 (ASxxx)</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="3" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-4-6-through-5-4-20-in-exchange-online">5.4.6 or 5.4.14</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="4" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/unable-to-relay-blocked-by-allow-list">5.7.1. Unable To Relay</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="5" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-4-4-7-in-exchange-online">550 4.4.7</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="6" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-0-350-in-exchange-online">550 5.0.350</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="7" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/550-x-dg-ref-header-too-long-ndr">550 x-dg-ref header is too long</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="8" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-1-0-in-exchange-online">550 5.1.0</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="9" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/exrecipnotfound-ndr">550 5.1.1 RESOLVER.<wbr>ADR.<wbr>ExRecipNotFound</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="10" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-1-1-through-5-1-20-in-exchange-online">550 5.1.1 through 550 5.1.20</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="11" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-1-8-in-exchange-online">550 5.1.8 Access denied</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="12" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-1-10-in-exchange-online">550 5.1.10</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="13" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/recipientnotfound-ndr">550 5.1.10 RESOLVER.<wbr>ADR.<wbr>RecipientNotFound</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="14" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/badprimary-ndr">550 5.2.0 RESOLVER.<wbr>ADR.<wbr>BadPrimary</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="15" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-4-1-in-exchange-online">550 5.4.1</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="16" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/550-5-6-0-approval-invalidexpiry-cannot-read-expiry-poilcy-error">550 5.6.0 APPROVAL.<wbr>InvalidExpiry</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="17" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-6-11-in-exchange-online">550 5.6.11</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="18" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-7-1-in-exchange-online">550 5.7.1</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="19" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-12-in-exchange-online">550 5.7.12 or 5.7.12</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="20" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-13-or-5-7-135-in-exchange-online">550 5.7.13 or 550 5.7.135</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="21" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-23-in-exchange-online">550 5.7.23</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="22" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-57-in-exchange-online">550 5.7.57</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="23" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-64-in-exchange-online">550 5.7.64</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="24" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/relay-access-denied-smtp">550 5.7.64 TenantAttribution when sending emails externally</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="25" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/tenantattribution-ndr">550 5.7.64 TenantAttribution when sending emails through EOP</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="26" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-124-in-exchange-online">550 5.7.124 or 5.7.124</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="27" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-133-in-exchange-online">550 5.7.133</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="28" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-134-in-exchange-online">550 5.7.134</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="29" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-136-in-exchange-online">550 5.7.136</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="30" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-5-7-700-through-5-7-750">550 5.7.700 through 550 5.7.750</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="31" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/remote-server-returned-mailbox-busy">554 4.3.2 mailbox busy</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="32" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/mapiexceptionnotfound-ndr">554 5.2.0 STOREDRV.<wbr>Deliver.<wbr>Exception</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="33" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/cannot-send-mail-mepf">554 5.2.2 mailbox full</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="34" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/invalid-message-ndr">554 5.6.0 Invalid message content</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="35" role="treeitem" tabindex="-1" class="tree-item is-leaf has-external-link-indicator" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/ndr-received-send-emails-microsoft365-groups">AggregateGroupMailbox is full</a></li><li role="none"><a aria-setsize="36" aria-level="3" aria-posinset="36" role="treeitem" tabindex="0" class="tree-item is-leaf has-external-link-indicator is-selected" data-bi-name="tree-leaf" href="https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-for-submission-quota-exceeded-in-exchange-online" aria-current="page">Error 'the sender's submission quota was exceeded'</a></li></ul></li></ul></li><li class="tree-item" aria-setsize="15" aria-level="1" aria-posinset="8" role="treeitem" tabindex="-1" id="title-8-1" aria-expanded="false"><span data-bi-name="tree-expander" class="tree-expander"><span class="tree-expander-indicator docon docon-chevron-right-light" aria-hidden="true"></span>Groups and Distribution Lists</span></li><li class="tree-item" aria-setsize="15" aria-level="1" aria-posinset="9" role="treeitem" tabindex="-1" id="title-9-1" aria-expanded="false"><span data-bi-name="tree-expander" class="tree-expander"><span class="tree-expander-indicator docon docon-chevron-right-light" aria-hidden="true"></span>Mobile Devices</span></li><li class="tree-item" aria-setsize="15" aria-level="1" aria-posinset="10" role="treeitem" tabindex="-1" id="title-10-1" aria-expanded="false"><span data-bi-name="tree-expander" class="tree-expander"><span class="tree-expander-indicator docon docon-chevron-right-light" aria-hidden="true"></span>Move/Migrate 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<h1 id="fix-ndr-error-the-senders-submission-quota-was-exceeded-in-exchange-online">Fix NDR error "the sender's submission quota was exceeded" in Exchange Online</h1>
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<p>It's frustrating when you get an error after sending an email message. This topic describes what you can do if you see the error:</p>
<blockquote>
<p>The message can't be submitted because the sender's submission quota was exceeded.</p>
</blockquote>
<p>in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN).</p>
<div class="heading-wrapper" data-heading-level="h2"><a class="anchor-link docon docon-link" href="#why-did-i-get-this-bounce-message" aria-label="Section titled: Why did I get this bounce message?"></a><h2 id="why-did-i-get-this-bounce-message" class="heading-anchor">Why did I get this bounce message?</h2></div>
<p>You received this NDR because you have exceeded the recipient rate limit (10,000 recipients per day).</p>
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<td aria-label="No value"><img src="../../exchangeonline/email-delivery/ndr/media/email-user-icon.png" role="presentation" data-linktype="relative-path">
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<td><a href="#i-got-this-bounce-message-how-do-i-fix-it" data-linktype="self-bookmark">I got this bounce message. How do I fix it?</a></td>
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<p>If you knowingly sent 10,000 messages in the last 24 hours, you need to wait one day before you can send email from your mailbox.</p>
<p>If you didn't send the messages and you suspect your account has been compromised, reset your password and scan your devices for malware. However, the attacker might have configured other settings on your mailbox (for example, Inbox rules to forward messages or additional mailbox delegates). So, follow the steps in <a href="/en-us/office365/troubleshoot/sign-In/determine-account-is-compromised" data-linktype="absolute-path">How to determine whether your Office 365 account has been compromised</a>.</p>
<div class="heading-wrapper" data-heading-level="h2"><a class="anchor-link docon docon-link" href="#im-an-email-admin-how-do-i-fix-this" aria-label="Section titled: I'm an email admin. How do I fix this?"></a><h2 id="im-an-email-admin-how-do-i-fix-this" class="heading-anchor">I'm an email admin. How do I fix this?</h2></div>
<p>More information about sending and receiving limits in Exchange Online is available at <a href="/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#receiving-and-sending-limits" data-linktype="absolute-path">Receiving and sending limits</a>.</p>
<p>The sending account might be compromised. You'll need to:</p>
<ul>
<li><p><a href="/en-us/office365/troubleshoot/sign-In/determine-account-is-compromised" data-linktype="absolute-path">Determine if the account is compromised</a>. If the account is compromised, follow the steps in <a href="/en-us/microsoft-365/security/office-365-security/responding-to-a-compromised-email-account" data-linktype="absolute-path">Responding to a Compromised Email Account in Exchange Online</a>.</p>
</li>
<li><p>To help prevent future account compromises, follow the recommendations in <a href="/en-us/microsoft-365/admin/security-and-compliance/secure-your-business-data" data-linktype="absolute-path">Top 10 ways to secure Microsoft 365 for business plans</a>.</p>
</li>
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