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Docker Mailserver
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Security | Fail2Ban
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GHCR
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Configuration
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Your Best Friend setup.sh
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User Management
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User Management
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Best Practices
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Best Practices
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DKIM
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DMARC
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SPF
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Auto-discovery
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Security
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Security
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Understanding the Ports
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SSL/TLS
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Fail2Ban
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Fail2Ban
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Table of contents
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Configuration files
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Docker-compose config
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Manage bans
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List bans
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Un-ban
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Mail Encryption
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Troubleshooting
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Troubleshooting
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Debugging
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Mail Delivery with POP3
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Advanced Configuration
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Advanced Configuration
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Optional Configuration
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Maintenance
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Maintenance
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Update and Cleanup
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Override the Default Configs
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Override the Default Configs
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Dovecot
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Postfix
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Modifications via Script
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LDAP Authentication
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Email Filtering with Sieve
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Email Gathering with Fetchmail
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Email Forwarding
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Email Forwarding
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Relay Hosts
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AWS SES
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Full-Text Search
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Kubernetes
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IPv6
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Examples
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Examples
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Tutorials
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Tutorials
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Basic Installation
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Mailserver behind Proxy
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Blog Posts
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Use Cases
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Use Cases
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Forward-Only Mailserver with LDAP
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Customize IMAP Folders
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FAQ
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Contributing
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Contributing
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Issues and Pull Requests
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Coding Style
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Tests
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Documentation
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DockerHub
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GHCR
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< div class = "md-sidebar__scrollwrap" >
< div class = "md-sidebar__inner" >
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Table of contents
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Configuration files
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Docker-compose config
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< / ul >
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< li class = "md-nav__item" >
< a href = "#manage-bans" class = "md-nav__link" >
Manage bans
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< nav class = "md-nav" aria-label = "Manage bans" >
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< li class = "md-nav__item" >
< a href = "#list-bans" class = "md-nav__link" >
List bans
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< a href = "#un-ban" class = "md-nav__link" >
Un-ban
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< div class = "md-content" data-md-component = "content" >
< article class = "md-content__inner md-typeset" >
< a href = "https://github.com/docker-mailserver/docker-mailserver/edit/master/docs/content/config/security/fail2ban.md" title = "Edit this page" class = "md-content__button md-icon" >
< 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 >
< / a >
< h1 > Fail2Ban< / h1 >
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< p > Fail2Ban is installed automatically and bans IP addresses for 3 hours after 3 failed attempts in 10 minutes by default.< / p >
< h2 id = "configuration-files" > < a class = "toclink" href = "#configuration-files" > Configuration files< / a > < / h2 >
< p > If you want to change this, you can easily edit < a href = "https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-jail.cf" > < code > config/fail2ban-jail.cf< / code > < / a > .< / p >
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< p > You can do the same with the values from < code > fail2ban.conf< / code > , e.g < code > dbpurgeage< / code > . In that case you need to edit < a href = "https://github.com/docker-mailserver/docker-mailserver/blob/master/config/fail2ban-fail2ban.cf" > < code > config/fail2ban-fail2ban.cf< / code > < / a > .< / p >
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< p > The configuration files need to be located at the root of the < code > /tmp/docker-mailserver/< / code > volume bind.< / p >
< p > This following configuration files from < code > /tmp/docker-mailserver/< / code > will be copied at boot time.< / p >
< ul >
< li > < code > fail2ban-jail.cf< / code > -> < code > /etc/fail2ban/jail.d/user-jail.local< / code > < / li >
< li > < code > fail2ban-fail2ban.cf< / code > -> < code > /etc/fail2ban/fail2ban.local< / code > < / li >
< / ul >
< h3 id = "docker-compose-config" > < a class = "toclink" href = "#docker-compose-config" > Docker-compose config< / a > < / h3 >
< p > Example configuration volume bind:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > volumes< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > ./config/:/tmp/docker-mailserver/< / span >
< / code > < / pre > < / div >
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< div class = "admonition attention" >
< p class = "admonition-title" > Attention< / p >
< p > The mail container must be launched with the < code > NET_ADMIN< / code > capability in order to be able to install the iptable rules that actually ban IP addresses.< / p >
< p > Thus either include < code > --cap-add=NET_ADMIN< / code > in the docker run commandline or the equivalent < code > docker-compose.yml< / code > :< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > cap_add< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > NET_ADMIN< / span >
< / code > < / pre > < / div >
< / div >
< p > If you don't you will see errors the form of:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "go" > iptables -w -X f2b-postfix -- stderr: " getsockopt failed strangely: Operation not permitted\niptables v1.4.21: can' t initialize iptabl< / span >
< span class = "go" > es table `filter' : Permission denied (you must be root)\nPerhaps iptables or your kernel needs to be upgraded.\niptables v1.4.21: can' < / span >
< span class = "go" > t initialize iptables table `filter' : Permission denied (you must be root)\nPerhaps iptables or your kernel needs to be upgraded.\n" < / span >
< span class = "go" > 2016-06-01 00:53:51,284 fail2ban.action [678]: ERROR iptables -w -D INPUT -p tcp -m multiport --dports smtp,465,submission -< / span >
< span class = "go" > j f2b-postfix< / span >
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< h2 id = "manage-bans" > < a class = "toclink" href = "#manage-bans" > Manage bans< / a > < / h2 >
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< p > You can also manage and list the banned IPs with the < a href = "../../setup.sh/" > < code > setup.sh< / code > < / a > script.< / p >
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< h3 id = "list-bans" > < a class = "toclink" href = "#list-bans" > List bans< / a > < / h3 >
< div class = "highlight" > < pre > < span > < / span > < code > ./setup.sh debug fail2ban
< / code > < / pre > < / div >
< h3 id = "un-ban" > < a class = "toclink" href = "#un-ban" > Un-ban< / a > < / h3 >
< p > Here < code > 192.168.1.15< / code > is our banned IP.< / p >
< div class = "highlight" > < pre > < span > < / span > < code > ./setup.sh debug fail2ban unban < span class = "m" > 192< / span > .168.1.15
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