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mailcow: dockerized documentation
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Local MTA on Docker host
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Prerequisites
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Prepare your system
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DNS setup
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Installation, Update & Migration
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Installation, Update & Migration
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Installation
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Update
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Migration
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Deinstallation
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Post Installation Tasks
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Post Installation Tasks
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Advanced SSL
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Disable IPv6
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IP bindings
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Local MTA on Docker host
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Logging
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Relayhosts
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Reverse Proxy
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Rspamd UI
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SNAT
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Sync job migration
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Add trusted networks
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Models
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Models
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ACL
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Password hashing
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Sender and receiver model
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General Troubleshooting
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General Troubleshooting
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Introduction
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Logs
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Attach a Container
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Reset Passwords (incl. SQL)
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Manual MySQL upgrade
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Remove Persistent Data
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Common Problems
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Admin login to SOGo
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Reset TLS certificates
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Backup & Restore
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Backup & Restore
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Helper script
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Helper script
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Backup
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Restore
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Manually
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Manually
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Maildir
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MySQL
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Manual/Guides/Examples
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Manual/Guides/Examples
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mailcow UI
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mailcow UI
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Configuration
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CSS overrides
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Blacklist / Whitelist
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Pushover
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Spamfilter
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Temporary email aliases
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Tagging
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Two-Factor Authentication
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WebAuthn / FIDO2
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Postfix
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Postfix
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Custom transport maps
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< a href = "../u_e-postfix-postscreen_whitelist/" class = "md-nav__link" >
Whitelist IP in Postscreen
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Customize/Expand main.cf
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Disable Sender Addresses Verification
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Max. message size (attachment size)
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Statistics with pflogsumm
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Unbound
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< nav class = "md-nav" aria-label = "Unbound" data-md-level = "2" >
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Unbound
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Using an external DNS service
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Dovecot
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< span class = "md-nav__icon md-icon" > < / span >
Dovecot
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Mail crypt
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Public folders
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Nginx
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Docker
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Docker
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< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z" / > < / svg >
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< h1 > Local MTA on Docker host< / h1 >
< p > The easiest option would be to disable the listener on port 25/tcp.< / p >
< p > < strong > Postfix< / strong > users disable the listener by commenting the following line (starting with < code > smtp< / code > or < code > 25< / code > ) in < code > /etc/postfix/master.cf< / code > :
< div class = "highlight" > < pre > < span > < / span > < code > #smtp inet n - - - - smtpd
< / code > < / pre > < / div > < / p >
< p > Furthermore, to relay over a dockerized mailcow, you may want to add < code > 172.22.1.1< / code > as relayhost and remove the Docker interface from "inet_interfaces":< / p >
< div class = "highlight" > < pre > < span > < / span > < code > postconf -e ' relayhost = 172.22.1.1'
postconf -e " mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128"
postconf -e " inet_interfaces = loopback-only"
postconf -e " relay_transport = relay"
postconf -e " default_transport = smtp"
< / code > < / pre > < / div >
< p > < strong > Now it is important< / strong > to not have the same FQDN in < code > myhostname< / code > as you use for your dockerized mailcow. Check your local (non-Docker) Postfix' main.cf for < code > myhostname< / code > and set it to something different, for example < code > local.my.fqdn.tld< / code > .< / p >
< p > "172.22.1.1" is the mailcow created network gateway in Docker.
Relaying over this interface is necessary (instead of - for example - relaying directly over ${MAILCOW_HOSTNAME}) to relay over a known internal network.< / p >
< p > Restart Postfix after applying your changes.< / p >
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