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<li class="md-nav__item">
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<a href="../../../introduction/" class="md-nav__link">
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Introduction
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3" type="checkbox" id="__nav_3" checked>
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<label class="md-nav__link" for="__nav_3">
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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="Configuration" data-md-level="1">
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<label class="md-nav__title" for="__nav_3">
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<span class="md-nav__icon md-icon"></span>
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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="../../setup.sh/" class="md-nav__link">
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Your Best Friend setup.sh
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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="../../environment/" class="md-nav__link">
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Environment Variables
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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_3" data-md-state="indeterminate" type="checkbox" id="__nav_3_3" checked>
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<label class="md-nav__link" for="__nav_3_3">
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User Management
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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="User Management" data-md-level="2">
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<label class="md-nav__title" for="__nav_3_3">
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<span class="md-nav__icon md-icon"></span>
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User Management
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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="../../user-management/accounts/" class="md-nav__link">
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Accounts
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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="../../user-management/aliases/" class="md-nav__link">
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Aliases
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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_4" data-md-state="indeterminate" type="checkbox" id="__nav_3_4" checked>
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<label class="md-nav__link" for="__nav_3_4">
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Best Practices
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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="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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</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="../../best-practices/dkim/" class="md-nav__link">
|
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DKIM
|
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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="../../best-practices/dmarc/" class="md-nav__link">
|
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DMARC
|
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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="../../best-practices/spf/" class="md-nav__link">
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SPF
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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="../../best-practices/autodiscover/" class="md-nav__link">
|
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Auto-discovery
|
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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--active md-nav__item--nested">
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<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3_5" 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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</label>
|
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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="../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="../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="../fail2ban/" class="md-nav__link">
|
|
Fail2Ban
|
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</a>
|
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
|
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<label class="md-nav__link md-nav__link--active" for="__toc">
|
|
Mail Encryption
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<a href="./" class="md-nav__link md-nav__link--active">
|
|
Mail Encryption
|
|
</a>
|
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|
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
|
|
|
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|
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<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="#basic-setup" class="md-nav__link">
|
|
Basic Setup
|
|
</a>
|
|
|
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</li>
|
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|
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</ul>
|
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|
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</nav>
|
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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_6" data-md-state="indeterminate" type="checkbox" id="__nav_3_6" checked>
|
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|
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<label class="md-nav__link" for="__nav_3_6">
|
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Troubleshooting
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
<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>
|
|
Troubleshooting
|
|
</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item">
|
|
<a href="../../troubleshooting/debugging/" class="md-nav__link">
|
|
Debugging
|
|
</a>
|
|
</li>
|
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|
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</ul>
|
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</nav>
|
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</li>
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<li class="md-nav__item">
|
|
<a href="../../pop3/" class="md-nav__link">
|
|
Mail Delivery with POP3
|
|
</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" data-md-state="indeterminate" type="checkbox" id="__nav_3_8" checked>
|
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|
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<label class="md-nav__link" for="__nav_3_8">
|
|
Advanced Configuration
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
<nav class="md-nav" aria-label="Advanced Configuration" data-md-level="2">
|
|
<label class="md-nav__title" for="__nav_3_8">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Advanced Configuration
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item">
|
|
<a href="../../advanced/optional-config/" class="md-nav__link">
|
|
Optional Configuration
|
|
</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_2" data-md-state="indeterminate" type="checkbox" id="__nav_3_8_2" checked>
|
|
|
|
<label class="md-nav__link" for="__nav_3_8_2">
|
|
Maintenance
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
<nav class="md-nav" aria-label="Maintenance" data-md-level="3">
|
|
<label class="md-nav__title" for="__nav_3_8_2">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Maintenance
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/maintenance/update-and-cleanup/" class="md-nav__link">
|
|
Update and Cleanup
|
|
</a>
|
|
</li>
|
|
|
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|
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|
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</ul>
|
|
</nav>
|
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</li>
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<li class="md-nav__item md-nav__item--nested">
|
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|
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|
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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>
|
|
|
|
<label class="md-nav__link" for="__nav_3_8_3">
|
|
Override the Default Configs
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
<nav class="md-nav" aria-label="Override the Default Configs" data-md-level="3">
|
|
<label class="md-nav__title" for="__nav_3_8_3">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Override the Default Configs
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
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|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/override-defaults/dovecot/" class="md-nav__link">
|
|
Dovecot
|
|
</a>
|
|
</li>
|
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/override-defaults/postfix/" class="md-nav__link">
|
|
Postfix
|
|
</a>
|
|
</li>
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/override-defaults/user-patches/" class="md-nav__link">
|
|
Modifications via Script
|
|
</a>
|
|
</li>
|
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|
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|
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</ul>
|
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</nav>
|
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</li>
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<li class="md-nav__item">
|
|
<a href="../../advanced/auth-ldap/" class="md-nav__link">
|
|
LDAP Authentication
|
|
</a>
|
|
</li>
|
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|
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|
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<li class="md-nav__item">
|
|
<a href="../../advanced/mail-sieve/" class="md-nav__link">
|
|
Email Filtering with Sieve
|
|
</a>
|
|
</li>
|
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|
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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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|
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|
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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>
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/mail-forwarding/relay-hosts/" class="md-nav__link">
|
|
Relay Hosts
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/mail-forwarding/aws-ses/" class="md-nav__link">
|
|
AWS SES
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
</li>
|
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|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/full-text-search/" class="md-nav__link">
|
|
Full-Text Search
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
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|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/kubernetes/" class="md-nav__link">
|
|
Kubernetes
|
|
</a>
|
|
</li>
|
|
|
|
|
|
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|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../advanced/ipv6/" class="md-nav__link">
|
|
IPv6
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
</li>
|
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|
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</ul>
|
|
</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_4" data-md-state="indeterminate" type="checkbox" id="__nav_4" checked>
|
|
|
|
<label class="md-nav__link" for="__nav_4">
|
|
Examples
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
<nav class="md-nav" aria-label="Examples" data-md-level="1">
|
|
<label class="md-nav__title" for="__nav_4">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Examples
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
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<li class="md-nav__item md-nav__item--nested">
|
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|
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|
|
<input class="md-nav__toggle md-toggle" data-md-toggle="__nav_4_1" data-md-state="indeterminate" type="checkbox" id="__nav_4_1" checked>
|
|
|
|
<label class="md-nav__link" for="__nav_4_1">
|
|
Tutorials
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
<nav class="md-nav" aria-label="Tutorials" data-md-level="2">
|
|
<label class="md-nav__title" for="__nav_4_1">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Tutorials
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../../examples/tutorials/basic-installation/" class="md-nav__link">
|
|
Basic Installation
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<h1>Mail Encryption</h1>
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<div class="admonition info">
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<p class="admonition-title">Info</p>
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<p>The Mail crypt plugin is used to secure email messages stored in a Dovecot system. Messages are encrypted before written to storage and decrypted after reading. Both operations are transparent to the user.</p>
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<p>In case of unauthorized access to the storage backend, the messages will, without access to the decryption keys, be unreadable to the offending party.</p>
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<p>There can be a single encryption key for the whole system or each user can have a key of their own. The used cryptographical methods are widely used standards and keys are stored in portable formats, when possible.</p>
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<p>Official Dovecot documentation: <a href="https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/">https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/</a></p>
|
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<hr />
|
|
<h2 id="basic-setup"><a class="toclink" href="#basic-setup">Basic Setup</a></h2>
|
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<ol>
|
|
<li>Before you can enable mail_crypt, you'll need to copy out several dovecot/conf.d files to the host (from a running container) and then take the container down:
|
|
<div class="highlight"><pre><span></span><code>mkdir -p config/dovecot
|
|
docker cp mailserver:/etc/dovecot/conf.d/20-lmtp.conf config/dovecot/
|
|
docker cp mailserver:/etc/dovecot/conf.d/20-imap.conf config/dovecot/
|
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docker cp mailserver:/etc/dovecot/conf.d/20-pop3.conf config/dovecot/
|
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docker-compose down
|
|
</code></pre></div></li>
|
|
<li>You then need to <a href="https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#ec-key">generate your global EC key</a>.</li>
|
|
<li>The EC key needs to be available in the container. I prefer to mount a /certs directory into the container:
|
|
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span>
|
|
<span class="nt">mailserver</span><span class="p">:</span>
|
|
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">docker.io/mailserver/docker-mailserver:latest</span>
|
|
<span class="nt">volumes</span><span class="p">:</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">. . .</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">- ./certs/:/certs</span>
|
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<span class="l l-Scalar l-Scalar-Plain">. . .</span>
|
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</code></pre></div></li>
|
|
<li>While you're editing the docker-compose.yml, add the configuration files you copied out:
|
|
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span>
|
|
<span class="nt">mailserver</span><span class="p">:</span>
|
|
<span class="nt">image</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">docker.io/mailserver/docker-mailserver:latest</span>
|
|
<span class="nt">volumes</span><span class="p">:</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">. . .</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">- ./config/dovecot/20-lmtp.conf:/etc/dovecot/conf.d/20-lmtp.conf</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">- ./config/dovecot/20-imap.conf:/etc/dovecot/conf.d/20-imap.conf</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">- ./config/dovecot/20-pop3.conf:/etc/dovecot/conf.d/20-pop3.conf</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">- ./certs/:/certs</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">. . .</span>
|
|
</code></pre></div></li>
|
|
<li>The <code>mail_crypt</code> plugin, unless you're using a non-standard configuration of docker-mailserver, should be enabled on both <code>lmtp</code> and <code>imap</code>. You'll want to edit three different files:<ul>
|
|
<li><code>./config/dovecot/20-lmtp.conf</code>
|
|
<div class="highlight"><pre><span></span><code>protocol lmtp {
|
|
mail_plugins = $mail_plugins sieve mail_crypt
|
|
plugin {
|
|
mail_crypt_global_private_key = </certs/ecprivkey.pem
|
|
mail_crypt_global_public_key = </certs/ecpubkey.pem
|
|
mail_crypt_save_version = 2
|
|
}
|
|
}
|
|
</code></pre></div></li>
|
|
<li><code>./config/dovecot/20-imap.conf</code>
|
|
<div class="highlight"><pre><span></span><code>protocol imap {
|
|
mail_plugins = $mail_plugins imap_quota mail_crypt
|
|
plugin {
|
|
mail_crypt_global_private_key = </certs/ecprivkey.pem
|
|
mail_crypt_global_public_key = </certs/ecpubkey.pem
|
|
mail_crypt_save_version = 2
|
|
}
|
|
}
|
|
</code></pre></div></li>
|
|
<li>If you use pop3, make the same changes in <code>20-pop3.conf</code></li>
|
|
</ul>
|
|
</li>
|
|
<li>Start the container and monitor the logs for any errors</li>
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|
</ol>
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<p>This should be the minimum required for encryption of the mail while in storage.</p>
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