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<a href="../../troubleshooting/debug-reset_pw/" class="md-nav__link">
Reset Passwords (incl. SQL)
</a>
</li>
<li class="md-nav__item">
<a href="../../troubleshooting/debug-reset_tls/" class="md-nav__link">
Reset TLS certificates
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</li>
</ul>
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</li>
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7" >
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Backup & Restore
<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_7_label" aria-expanded="false">
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Backup & Restore
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<ul class="md-nav__list" data-md-scrollfix>
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Component backup & restore
<span class="md-nav__icon md-icon"></span>
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Component backup & restore
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<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<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
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<li class="md-nav__item">
<a href="../../backup_restore/b_n_r-coldstandby/" class="md-nav__link">
Cold-standby (rolling backup)
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<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>
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<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_7_3_label" aria-expanded="false">
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Manual backups
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<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)
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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
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<li class="md-nav__item md-nav__item--nested">
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8" >
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Manual/Guides/Examples
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<label class="md-nav__title" for="__nav_8">
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Manual/Guides/Examples
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<li class="md-nav__item md-nav__item--nested">
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<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>
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<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>
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<li class="md-nav__item">
<a href="../../manual-guides/Postfix/u_e-postfix-extra_cf/" class="md-nav__link">
Customize/Expand main.cf
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<a href="../../manual-guides/Postfix/u_e-postfix-disable_sender_verification/" class="md-nav__link">
Disable Sender Addresses Verification
</a>
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<li class="md-nav__item">
<a href="../../manual-guides/Postfix/u_e-postfix-attachment_size/" class="md-nav__link">
Max. message size (attachment size)
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<li class="md-nav__item">
<a href="../../manual-guides/Postfix/u_e-postfix-relayhost/" class="md-nav__link">
Relayhosts
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<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
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Unbound
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</label>
<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_3_label" aria-expanded="false">
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Unbound
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<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
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</ul>
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8_4" >
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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>
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Nginx
<span class="md-nav__icon md-icon"></span>
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<nav class="md-nav" data-md-level="2" aria-labelledby="__nav_8_5_label" aria-expanded="false">
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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>
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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>
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<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>
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<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
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<a href="../../manual-guides/SOGo/u_e-sogo/" class="md-nav__link">
SOGo
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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>
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<a href="../../manual-guides/u_e-why_unbound/" class="md-nav__link">
Why unbound?
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<a href="../../manual-guides/u_e-autodiscover_config/" class="md-nav__link">
Autodiscover / Autoconfig
</a>
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<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
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Client Configuration
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<a href="../../client/client/" class="md-nav__link">
Overview
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Android
</a>
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Apple macOS / iOS
</a>
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eM Client
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KDE Kontact
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Microsoft Outlook
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Mozilla Thunderbird
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Windows Mail
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Third party apps
</label>
<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../third_party/borgmatic/third_party-borgmatic/" class="md-nav__link">
Borgmatic Backup
</a>
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<li class="md-nav__item">
<a href="../../third_party/checkmk/u_e-checkmk/" class="md-nav__link">
CheckMK
</a>
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Exchange Hybrid Setup
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<a href="../../third_party/gitea/third_party-gitea/" class="md-nav__link">
Gitea
</a>
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<a href="../../third_party/gogs/third_party-gogs/" class="md-nav__link">
Gogs
</a>
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<a href="../../third_party/mailman3/third_party-mailman3/" class="md-nav__link">
Mailman 3
</a>
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Mailpiler Integration
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Nextcloud
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Portainer
</a>
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Roundcube
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<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<h1>Disable IPv6</h1>
<p>This is <strong>ONLY</strong> recommended if you do not have an IPv6 enabled network on your host!</p>
<p>If you really need to, you can disable the usage of IPv6 in the compose file.
Additionally, you can also disable the startup of container "ipv6nat-mailcow", as it's not needed if you won't use IPv6.</p>
<p>Instead of editing docker-compose.yml directly, it is preferable to create an override file for it
and implement your changes to the service there. Unfortunately, this right now only seems to work for services, not for network settings.</p>
<p>To disable IPv6 on the mailcow network, open docker-compose.yml with your favourite text editor and search for the network section (it's near the bottom of the file). </p>
<p><strong>1.</strong> Modify docker-compose.yml</p>
<p>Change <code>enable_ipv6: true</code> to <code>enable_ipv6: false</code>:</p>
<div class="highlight"><pre><span></span><code>networks:
mailcow-network:
[...]
enable_ipv6: true # &lt;&lt;&lt; set to false
[...]
</code></pre></div>
<p><strong>2.</strong> Disable ipv6nat-mailcow</p>
<p>To disable the ipv6nat-mailcow container as well, go to your mailcow directory and create a new file called "docker-compose.override.yml": </p>
<p><strong>NOTE:</strong> If you already have an override file, of course don't recreate it, but merge the lines below into your existing one accordingly!</p>
<div class="highlight"><pre><span></span><code># cd /opt/mailcow-dockerized
# touch docker-compose.override.yml
</code></pre></div>
<p>Open the file in your favourite text editor and fill in the following:</p>
<div class="highlight"><pre><span></span><code>version: &#39;2.1&#39;
services:
ipv6nat-mailcow:
image: bash:latest
restart: &quot;no&quot;
entrypoint: [&quot;echo&quot;, &quot;ipv6nat disabled in compose.override.yml&quot;]
</code></pre></div>
<p>For these changes to be effective, you need to fully stop and then restart the stack, so containers and networks are recreated:</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">docker compose (Plugin)</label><label for="__tabbed_1_2">docker-compose (Standalone)</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span>compose<span class="w"> </span>down
docker<span class="w"> </span>compose<span class="w"> </span>up<span class="w"> </span>-d
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker-compose<span class="w"> </span>down
docker-compose<span class="w"> </span>up<span class="w"> </span>-d
</code></pre></div>
</div>
</div>
</div>
<p><strong>3.</strong> Disable IPv6 in unbound-mailcow</p>
<p>Edit <code>data/conf/unbound/unbound.conf</code> and set <code>do-ip6</code> to "no":</p>
<div class="highlight"><pre><span></span><code>server:
[...]
do-ip6: no
[...]
</code></pre></div>
<p>Restart Unbound:</p>
<div class="tabbed-set tabbed-alternate" data-tabs="2:2"><input checked="checked" id="__tabbed_2_1" name="__tabbed_2" type="radio" /><input id="__tabbed_2_2" name="__tabbed_2" type="radio" /><div class="tabbed-labels"><label for="__tabbed_2_1">docker compose (Plugin)</label><label for="__tabbed_2_2">docker-compose (Standalone)</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span>compose<span class="w"> </span>restart<span class="w"> </span>unbound-mailcow
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker-compose<span class="w"> </span>restart<span class="w"> </span>unbound-mailcow
</code></pre></div>
</div>
</div>
</div>
<p><strong>4.</strong> Disable IPv6 in postfix-mailcow</p>
<p>Create <code>data/conf/postfix/extra.cf</code> and set <code>smtp_address_preference</code> to <code>ipv4</code>:</p>
<div class="highlight"><pre><span></span><code>smtp_address_preference = ipv4
inet_protocols = ipv4
</code></pre></div>
<p>Restart Postfix:</p>
<div class="tabbed-set tabbed-alternate" data-tabs="3:2"><input checked="checked" id="__tabbed_3_1" name="__tabbed_3" type="radio" /><input id="__tabbed_3_2" name="__tabbed_3" type="radio" /><div class="tabbed-labels"><label for="__tabbed_3_1">docker compose (Plugin)</label><label for="__tabbed_3_2">docker-compose (Standalone)</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker<span class="w"> </span>compose<span class="w"> </span>restart<span class="w"> </span>postfix-mailcow
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code>docker-compose<span class="w"> </span>restart<span class="w"> </span>postfix-mailcow
</code></pre></div>
</div>
</div>
</div>
<p><strong>5.</strong> If your docker daemon completly disabled IPv6:</p>
<p>Fix the following NGINX, Dovecot and php-fpm config files</p>
<div class="highlight"><pre><span></span><code>sed -i &#39;/::/d&#39; data/conf/nginx/listen_*
sed -i &#39;/::/d&#39; data/conf/nginx/templates/listen*
sed -i &#39;/::/d&#39; data/conf/nginx/dynmaps.conf
sed -i &#39;s/,\[::\]//g&#39; data/conf/dovecot/dovecot.conf
sed -i &#39;s/\[::\]://g&#39; data/conf/phpfpm/php-fpm.d/pools.conf
</code></pre></div>
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