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<a href="../../.." class="md-nav__link">
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<nav class="md-nav" aria-label="Configuration" data-md-level="1">
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<li class="md-nav__item">
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<a href="../../setup.sh/" class="md-nav__link">
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<li class="md-nav__item">
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<a href="../../environment/" class="md-nav__link">
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User Management
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<a href="../../user-management/accounts/" class="md-nav__link">
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<nav class="md-nav" aria-label="Best Practices" data-md-level="2">
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<label class="md-nav__title" for="__nav_3_4">
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<span class="md-nav__icon md-icon"></span>
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Best Practices
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../dkim/" class="md-nav__link">
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DKIM
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</a>
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<li class="md-nav__item md-nav__item--active">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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DMARC
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<span class="md-nav__icon md-icon"></span>
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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DMARC
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</a>
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#enabling-dmarc" class="md-nav__link">
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Enabling DMARC
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</a>
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</ul>
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</nav>
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<li class="md-nav__item">
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<a href="../spf/" class="md-nav__link">
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SPF
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</a>
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<li class="md-nav__item">
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<a href="../autodiscover/" class="md-nav__link">
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Auto-discovery
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</ul>
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</nav>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_5" data-md-state="indeterminate" type="checkbox" id="__nav_3_5" checked>
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<label class="md-nav__link" for="__nav_3_5">
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Security
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<span class="md-nav__icon md-icon"></span>
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<nav class="md-nav" aria-label="Security" data-md-level="2">
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<label class="md-nav__title" for="__nav_3_5">
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<span class="md-nav__icon md-icon"></span>
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Security
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../security/understanding-the-ports/" class="md-nav__link">
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Understanding the Ports
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../security/ssl/" class="md-nav__link">
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SSL/TLS
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../security/fail2ban/" class="md-nav__link">
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Fail2Ban
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../security/mail_crypt/" class="md-nav__link">
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Mail Encryption
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</a>
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</ul>
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</nav>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_6" data-md-state="indeterminate" type="checkbox" id="__nav_3_6" checked>
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<label class="md-nav__link" for="__nav_3_6">
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Troubleshooting
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<span class="md-nav__icon md-icon"></span>
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<nav class="md-nav" aria-label="Troubleshooting" data-md-level="2">
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<label class="md-nav__title" for="__nav_3_6">
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<span class="md-nav__icon md-icon"></span>
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Troubleshooting
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../troubleshooting/debugging/" class="md-nav__link">
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Debugging
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</a>
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</ul>
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</nav>
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<li class="md-nav__item">
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<a href="../../pop3/" class="md-nav__link">
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Mail Delivery with POP3
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_8" data-md-state="indeterminate" type="checkbox" id="__nav_3_8" checked>
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<label class="md-nav__link" for="__nav_3_8">
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Advanced Configuration
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Advanced Configuration" data-md-level="2">
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<label class="md-nav__title" for="__nav_3_8">
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<span class="md-nav__icon md-icon"></span>
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Advanced Configuration
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
|
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<a href="../../advanced/optional-config/" class="md-nav__link">
|
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Optional Configuration
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</a>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_8_2" data-md-state="indeterminate" type="checkbox" id="__nav_3_8_2" checked>
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<label class="md-nav__link" for="__nav_3_8_2">
|
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Maintenance
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" aria-label="Maintenance" data-md-level="3">
|
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<label class="md-nav__title" for="__nav_3_8_2">
|
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<span class="md-nav__icon md-icon"></span>
|
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Maintenance
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
|
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<a href="../../advanced/maintenance/update-and-cleanup/" class="md-nav__link">
|
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Update and Cleanup
|
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_8_3" data-md-state="indeterminate" type="checkbox" id="__nav_3_8_3" checked>
|
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|
|
<label class="md-nav__link" for="__nav_3_8_3">
|
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Override the Default Configs
|
|
<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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|
|
<nav class="md-nav" aria-label="Override the Default Configs" data-md-level="3">
|
|
<label class="md-nav__title" for="__nav_3_8_3">
|
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<span class="md-nav__icon md-icon"></span>
|
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Override the Default Configs
|
|
</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
|
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<a href="../../advanced/override-defaults/dovecot/" class="md-nav__link">
|
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Dovecot
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../../advanced/override-defaults/postfix/" class="md-nav__link">
|
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Postfix
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../../advanced/override-defaults/user-patches/" class="md-nav__link">
|
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Modifications via Script
|
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</a>
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</li>
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</ul>
|
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</nav>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../../advanced/auth-ldap/" class="md-nav__link">
|
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LDAP Authentication
|
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</a>
|
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</li>
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<li class="md-nav__item">
|
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<a href="../../advanced/mail-sieve/" class="md-nav__link">
|
|
Email Filtering with Sieve
|
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</a>
|
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</li>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-fetchmail/" class="md-nav__link">
|
|
Email Gathering with Fetchmail
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item md-nav__item--nested">
|
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_8_7" data-md-state="indeterminate" type="checkbox" id="__nav_3_8_7" checked>
|
|
|
|
|
|
|
|
|
|
<label class="md-nav__link" for="__nav_3_8_7">
|
|
Email Forwarding
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" aria-label="Email Forwarding" data-md-level="3">
|
|
<label class="md-nav__title" for="__nav_3_8_7">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Email Forwarding
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
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|
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|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-forwarding/relay-hosts/" class="md-nav__link">
|
|
Relay Hosts
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-forwarding/aws-ses/" class="md-nav__link">
|
|
AWS SES
|
|
</a>
|
|
</li>
|
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</ul>
|
|
</nav>
|
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</li>
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<li class="md-nav__item">
|
|
<a href="../../advanced/full-text-search/" class="md-nav__link">
|
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Full-Text Search
|
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</a>
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</li>
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<li class="md-nav__item">
|
|
<a href="../../advanced/kubernetes/" class="md-nav__link">
|
|
Kubernetes
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/ipv6/" class="md-nav__link">
|
|
IPv6
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/podman/" class="md-nav__link">
|
|
Podman
|
|
</a>
|
|
</li>
|
|
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|
|
</ul>
|
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<div class="highlight"><pre><span></span><code>_dmarc.example.com. IN TXT "v=DMARC1; p=none; rua=mailto:dmarc.report@example.com; ruf=mailto:dmarc.report@example.com; sp=none; ri=86400"
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<p>Or a bit more strict policies (<em>mind <code>p=quarantine</code> and <code>sp=quarantine</code></em>):</p>
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<div class="highlight"><pre><span></span><code>_dmarc IN TXT "v=DMARC1; p=quarantine; rua=mailto:dmarc.report@example.com; ruf=mailto:dmarc.report@example.com; fo=0; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400; sp=quarantine"
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<p>DMARC status is not being displayed instantly in Gmail for instance. If you want to check it directly after DNS entries, you can use some services around the Internet such as from <a href="https://dmarcguide.globalcyberalliance.org">Global Cyber Alliance</a> or <a href="https://ondmarc.redsift.com">RedSift</a>. In other cases, email clients will show "DMARC: PASS" in ~1 day or so.</p>
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<p>Reference: <a href="https://github.com/docker-mailserver/docker-mailserver/issues/1511">#1511</a></p>
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