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<a href="../../../backup_restore/b_n_r-backup/" class="md-nav__link">
Backup
</a>
</li>
<li class="md-nav__item">
<a href="../../../backup_restore/b_n_r-restore/" class="md-nav__link">
Restore
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../../../backup_restore/b_n_r-coldstandby/" class="md-nav__link">
Cold-standby (rolling backup)
</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7_3" >
<label class="md-nav__link" for="__nav_7_3" id="__nav_7_3_label" tabindex="0">
Manual backups
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_7_3_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_7_3">
<span class="md-nav__icon md-icon"></span>
Manual backups
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../backup_restore/b_n_r-backup_restore-maildir/" class="md-nav__link">
Maildir
</a>
</li>
<li class="md-nav__item">
<a href="../../../backup_restore/b_n_r-backup_restore-mysql/" class="md-nav__link">
MySQL (mysqldump)
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7_4" >
<label class="md-nav__link" for="__nav_7_4" id="__nav_7_4_label" tabindex="0">
mailcow-internal backups
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_7_4_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_7_4">
<span class="md-nav__icon md-icon"></span>
mailcow-internal backups
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../backup_restore/b_n_r-accidental_deletion/" class="md-nav__link">
Recover accidentally deleted data
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8" >
<label class="md-nav__link" for="__nav_8" id="__nav_8_label" tabindex="0">
Manual/Guides/Examples
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_8_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8">
<span class="md-nav__icon md-icon"></span>
Manual/Guides/Examples
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_1" >
<label class="md-nav__link" for="__nav_8_1" id="__nav_8_1_label" tabindex="0">
mailcow UI
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_1_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_1">
<span class="md-nav__icon md-icon"></span>
mailcow UI
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-bl_wl/" class="md-nav__link">
Blacklist / Whitelist
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-config/" class="md-nav__link">
Configuration
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-css/" class="md-nav__link">
CSS overrides
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-netfilter/" class="md-nav__link">
Netfilter
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-pushover/" class="md-nav__link">
Pushover
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-spamfilter/" class="md-nav__link">
Spamfilter
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-sub_addressing/" class="md-nav__link">
Sub-addressing
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-tags/" class="md-nav__link">
Tags (for Domains and Mailboxes)
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-spamalias/" class="md-nav__link">
Temporary email aliases
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-tfa/" class="md-nav__link">
Two-Factor Authentication
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/mailcow-UI/u_e-mailcow_ui-fido/" class="md-nav__link">
WebAuthn / FIDO2
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_2" >
<label class="md-nav__link" for="__nav_8_2" id="__nav_8_2_label" tabindex="0">
Postfix
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_2_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_2">
<span class="md-nav__icon md-icon"></span>
Postfix
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-trust_networks/" class="md-nav__link">
Add trusted networks
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-custom_transport/" class="md-nav__link">
Custom transport maps
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-extra_cf/" class="md-nav__link">
Customize/Expand main.cf
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-disable_sender_verification/" class="md-nav__link">
Disable Sender Addresses Verification
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-attachment_size/" class="md-nav__link">
Max. message size (attachment size)
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-relayhost/" class="md-nav__link">
Relayhosts
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-pflogsumm/" class="md-nav__link">
Statistics with pflogsumm
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Postfix/u_e-postfix-postscreen_whitelist/" class="md-nav__link">
Whitelist IP in Postscreen
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_3" >
<label class="md-nav__link" for="__nav_8_3" id="__nav_8_3_label" tabindex="0">
Unbound
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_3_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_3">
<span class="md-nav__icon md-icon"></span>
Unbound
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/Unbound/u_e-unbound-fwd/" class="md-nav__link">
Using an external DNS service
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_4" >
<label class="md-nav__link" for="__nav_8_4" id="__nav_8_4_label" tabindex="0">
Dovecot
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_4_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_4">
<span class="md-nav__icon md-icon"></span>
Dovecot
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-extra_conf/" class="md-nav__link">
Customize/Expand dovecot.conf
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-any_acl/" class="md-nav__link">
Enable "any" ACL settings
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-expunge/" class="md-nav__link">
Expunge a Users mails
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-fts/" class="md-nav__link">
FTS (Solr)
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-idle_interval/" class="md-nav__link">
IMAP IDLE interval
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-mail-crypt/" class="md-nav__link">
Mail crypt
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-more/" class="md-nav__link">
More Examples with DOVEADM
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-vmail-volume/" class="md-nav__link">
Move Maildir (vmail)
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-public_folder/" class="md-nav__link">
Public folders
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-static_master/" class="md-nav__link">
Static master user
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Dovecot/u_e-dovecot-catchall_vacation/" class="md-nav__link">
Vacation replies for catchall addresses
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_5" >
<label class="md-nav__link" for="__nav_8_5" id="__nav_8_5_label" tabindex="0">
Nginx
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_5_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_5">
<span class="md-nav__icon md-icon"></span>
Nginx
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/Nginx/u_e-nginx_webmail-site/" class="md-nav__link">
Create subdomain webmail.example.org
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Nginx/u_e-nginx_custom/" class="md-nav__link">
Custom sites
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_6" >
<label class="md-nav__link" for="__nav_8_6" id="__nav_8_6_label" tabindex="0">
Watchdog
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_6_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_6">
<span class="md-nav__icon md-icon"></span>
Watchdog
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/Watchdog/u_e-watchdog-thresholds/" class="md-nav__link">
Thresholds
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Redis/u_e-redis/" class="md-nav__link">
Redis
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/Rspamd/u_e-rspamd/" class="md-nav__link">
Rspamd
</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_9" >
<label class="md-nav__link" for="__nav_8_9" id="__nav_8_9_label" tabindex="0">
ClamAV
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_9_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_9">
<span class="md-nav__icon md-icon"></span>
ClamAV
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/ClamAV/u_e-clamav-whitelist/" class="md-nav__link">
Whitelist
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/ClamAV/u_e-clamav-additional_dbs/" class="md-nav__link">
Additional Databases
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/SOGo/u_e-sogo/" class="md-nav__link">
SOGo
</a>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_11" >
<label class="md-nav__link" for="__nav_8_11" id="__nav_8_11_label" tabindex="0">
Docker
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_11_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_8_11">
<span class="md-nav__icon md-icon"></span>
Docker
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../manual-guides/Docker/u_e-docker-cust_dockerfiles/" class="md-nav__link">
Customize Dockerfiles
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/u_e-why_unbound/" class="md-nav__link">
Why unbound?
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/u_e-autodiscover_config/" class="md-nav__link">
Autodiscover / Autoconfig
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/u_e-80_to_443/" class="md-nav__link">
Redirect HTTP to HTTPS
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/u_e-reeanble-weak-protocols/" class="md-nav__link">
Re-enable TLS 1.0 and TLS 1.1
</a>
</li>
<li class="md-nav__item">
<a href="../../../manual-guides/u_e-update-hooks/" class="md-nav__link">
Run scripts before and after updates
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_9" >
<label class="md-nav__link" for="__nav_9" id="__nav_9_label" tabindex="0">
Client Configuration
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_9_label" aria-expanded="false">
<label class="md-nav__title" for="__nav_9">
<span class="md-nav__icon md-icon"></span>
Client Configuration
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../../client/client/" class="md-nav__link">
Overview
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-android/" class="md-nav__link">
Android
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-apple/" class="md-nav__link">
Apple macOS / iOS
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-emclient/" class="md-nav__link">
eM Client
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-kontact/" class="md-nav__link">
KDE Kontact
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-outlook/" class="md-nav__link">
Microsoft Outlook
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-thunderbird/" class="md-nav__link">
Mozilla Thunderbird
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-windows/" class="md-nav__link">
Windows Mail
</a>
</li>
<li class="md-nav__item">
<a href="../../../client/client-manual/" class="md-nav__link">
Manual configuration
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--active md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_10" checked>
<label class="md-nav__link" for="__nav_10" id="__nav_10_label" tabindex="0">
Third party apps
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_10_label" aria-expanded="true">
<label class="md-nav__title" for="__nav_10">
<span class="md-nav__icon md-icon"></span>
Third party apps
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../borgmatic/third_party-borgmatic/" class="md-nav__link">
Borgmatic Backup
</a>
</li>
<li class="md-nav__item">
<a href="../../checkmk/u_e-checkmk/" class="md-nav__link">
CheckMK
</a>
</li>
<li class="md-nav__item md-nav__item--active">
<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
<label class="md-nav__link md-nav__link--active" for="__toc">
Exchange Hybrid Setup
<span class="md-nav__icon md-icon"></span>
</label>
<a href="./" class="md-nav__link md-nav__link--active">
Exchange Hybrid Setup
</a>
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#requirements" class="md-nav__link">
Requirements
</a>
</li>
<li class="md-nav__item">
<a href="#set-up-the-mailcow" class="md-nav__link">
Set up the mailcow
</a>
</li>
<li class="md-nav__item">
<a href="#set-up-connectors-in-exchange" class="md-nav__link">
Set up Connectors in Exchange
</a>
</li>
<li class="md-nav__item">
<a href="#validating" class="md-nav__link">
Validating
</a>
<nav class="md-nav" aria-label="Validating">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#common-issues" class="md-nav__link">
Common Issues
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item">
<a href="../../gitea/third_party-gitea/" class="md-nav__link">
Gitea
</a>
</li>
<li class="md-nav__item">
<a href="../../gogs/third_party-gogs/" class="md-nav__link">
Gogs
</a>
</li>
<li class="md-nav__item">
<a href="../../mailman3/third_party-mailman3/" class="md-nav__link">
Mailman 3
</a>
</li>
<li class="md-nav__item">
<a href="../../mailpiler/third_party-mailpiler_integration/" class="md-nav__link">
Mailpiler Integration
</a>
</li>
<li class="md-nav__item">
<a href="../../nextcloud/third_party-nextcloud/" class="md-nav__link">
Nextcloud
</a>
</li>
<li class="md-nav__item">
<a href="../../portainer/third_party-portainer/" class="md-nav__link">
Portainer
</a>
</li>
<li class="md-nav__item">
<a href="../../roundcube/third_party-roundcube/" class="md-nav__link">
Roundcube
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</div>
</div>
</div>
<div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
<div class="md-sidebar__scrollwrap">
<div class="md-sidebar__inner">
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#requirements" class="md-nav__link">
Requirements
</a>
</li>
<li class="md-nav__item">
<a href="#set-up-the-mailcow" class="md-nav__link">
Set up the mailcow
</a>
</li>
<li class="md-nav__item">
<a href="#set-up-connectors-in-exchange" class="md-nav__link">
Set up Connectors in Exchange
</a>
</li>
<li class="md-nav__item">
<a href="#validating" class="md-nav__link">
Validating
</a>
<nav class="md-nav" aria-label="Validating">
<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#common-issues" class="md-nav__link">
Common Issues
</a>
</li>
</ul>
</nav>
</li>
</ul>
</nav>
</div>
</div>
</div>
<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<h1>Exchange Hybrid Setup</h1>
<p>Using Microsoft Exchange in a hybrid setup is possible with mailcow. With this setup you can add mailboxes on your mailcow and still use <a href="https://docs.microsoft.com/microsoft-365/security/office-365-security/exchange-online-protection-overview?view=o365-worldwide">Exchange Online Protection</a>.
<strong>All mailboxes setup in Exchange will receive their mails as usual</strong>, while with the hybrid approach additional Mailboxes can be setup in mailcow without any further configuration.</p>
<p>This setup becomes very handy if you have enabled the <a href="https://docs.microsoft.com/azure/active-directory/fundamentals/concept-fundamentals-security-defaults">Office 365 security defaults</a> and third party applications can no longer login into your mailboxes by any of the <a href="https://docs.microsoft.com/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365">supported methods</a>.</p>
<h2 id="requirements">Requirements<a class="headerlink" href="#requirements" title="Permanent link">&para;</a></h2>
<ul>
<li>The mx Record of your domain needs to point at the Exchange mail service. Log into your Admin center and look out for the dns settings of your domain to find your personalized gateway domain. It should look like this <code>contoso-com.mail.protection.outlook.com</code>. Contact your domain registrant to get further information on how to change mx record.</li>
<li>The domain you want to have additional mailboxes for must be setup as <code>internal relay domain</code> in Exchange.<ol>
<li>Log in to your <a href="https://admin.exchange.microsoft.com">Exchange Admin Center</a></li>
<li>Select the <code>mail flow</code> pane and click on <code>accepted domains</code></li>
<li>Select the domain and switch it from <code>authorative</code> to <code>internal relay</code></li>
</ol>
</li>
</ul>
<h2 id="set-up-the-mailcow">Set up the mailcow<a class="headerlink" href="#set-up-the-mailcow" title="Permanent link">&para;</a></h2>
<p>Your mailcow needs to relay all mails to your personalized Exchange Host. It is the same host address we already looked up for the mx Record.</p>
<ol>
<li>Add the domain to your mailcow</li>
<li><a href="../../../manual-guides/Postfix/u_e-postfix-relayhost/">Add your personalized Exchange Host address as relayhost</a></li>
<li>Add your personalized Exchange Host address as forwarding host to unconditionally accepted all relayed mails from Exchange. (Admin &gt; Configuration &amp; Details &gt; Configuration Dropdown &gt; Forwarding Hosts)</li>
<li>Go to the domain settings and select the newly added host on the <code>Sender-dependent transports</code> dropdown. Enable relaying by ticking the <code>Relay this domain</code>, <code>Relay all recipients</code> and the <code>Relay non-existing mailboxes only.</code> checkboxes</li>
</ol>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>From now on your mailcow will accept all mails relayed from Exchange. The <strong>inbound filtering and so the neural learning of your cow will no longer work</strong>. Because all mails are routed through Exchange the <a href="https://docs.microsoft.com/exchange/antispam-and-antimalware/antispam-and-antimalware?view=exchserver-2019">filtering process is handled there</a>.</p>
</div>
<h2 id="set-up-connectors-in-exchange">Set up Connectors in Exchange<a class="headerlink" href="#set-up-connectors-in-exchange" title="Permanent link">&para;</a></h2>
<p>All mail traffic now goes through Exchange. At this point the Exchange Online Protection already filters all incoming and outgoing mails. Now we need to set up two connectors to relay incoming mails from our Exchange Service to the mailcow and another one to allow mails relayed from the mailcow to our exchange service. You can follow the <a href="https://docs.microsoft.com/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail#2-set-up-a-connector-from-microsoft-365-or-office-365-to-your-email-server">official guide from Microsoft</a>.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>For the connector that handles mails from your mailcow to Exchange Microsoft offers two ways of authenticating it. The recommended way is to use a tls certificate configured with a subject name that matches an accepted domain in Exchange. Otherwise you need to choose authentication with the static ip address of your mailcow.</p>
</div>
<h2 id="validating">Validating<a class="headerlink" href="#validating" title="Permanent link">&para;</a></h2>
<p>The easiest way to validate the hybrid setup is by sending a mail from the internet to a mailbox that only exists on the mailcow and vice versa.</p>
<h3 id="common-issues">Common Issues<a class="headerlink" href="#common-issues" title="Permanent link">&para;</a></h3>
<ul>
<li>The connector validation from Exchange to your mailcow failed with <code>550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient test@contoso.com not found by SMTP address lookup</code><br />
<strong>Possible Solution:</strong> Your domain is not set up as <code>internal relay</code>. Exchange therefore cannot find the recipient</li>
<li>Mails sent from the mailcow to a mailbox in the internet cannot be sent. Non Delivery Report with error <code>550 5.7.64 TenantAttribution; Relay Access Denied</code><br />
<strong>Possible Solution:</strong> The authentication method failed. Make sure the certificate subject matches an accepted domain in Exchange. Try authenticating by static ip instead.</li>
</ul>
<p>Microsoft Guide for the connector setup and additional requirements: <a href="https://docs.microsoft.com/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail#prerequisites-for-your-on-premises-email-environment">https://docs.microsoft.com/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail#prerequisites-for-your-on-premises-email-environment</a></p>
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