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Docker Mailserver
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Advanced | IPv6
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docker-mailserver
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Home
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Introduction
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Usage
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Configuration
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Examples
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FAQ
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Contributing
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DockerHub
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GHCR
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Docker Mailserver
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< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 496 512" > <!-- ! Font Awesome Free 6.3.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc. --> < path d = "M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z" / > < / svg >
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docker-mailserver
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< ul class = "md-nav__list" data-md-scrollfix >
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< a href = "../../.." class = "md-nav__link" >
Home
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< li class = "md-nav__item" >
< a href = "../../../introduction/" class = "md-nav__link" >
Introduction
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< li class = "md-nav__item" >
< a href = "../../../usage/" class = "md-nav__link" >
Usage
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Configuration
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< nav class = "md-nav" data-md-level = "1" aria-labelledby = "__nav_4_label" aria-expanded = "true" >
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< label class = "md-nav__title" for = "__nav_4" >
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< span class = "md-nav__icon md-icon" > < / span >
Configuration
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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 = "../../environment/" class = "md-nav__link" >
Environment Variables
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< li class = "md-nav__item" >
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< a href = "../../user-management/" class = "md-nav__link" >
User Management
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< / a >
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< label class = "md-nav__link" for = "__nav_4_3" id = "__nav_4_3_label" tabindex = "0" >
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Best Practices
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< label class = "md-nav__title" for = "__nav_4_3" >
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< span class = "md-nav__icon md-icon" > < / span >
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 = "../../best-practices/dkim_dmarc_spf/" class = "md-nav__link" >
DKIM, DMARC & SPF
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< li class = "md-nav__item" >
< a href = "../../best-practices/autodiscover/" class = "md-nav__link" >
Auto-discovery
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< / ul >
< / nav >
< / 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 md-toggle--indeterminate" type = "checkbox" id = "__nav_4_4" >
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< label class = "md-nav__link" for = "__nav_4_4" id = "__nav_4_4_label" tabindex = "0" >
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Security
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< / label >
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_4_label" aria-expanded = "false" >
< label class = "md-nav__title" for = "__nav_4_4" >
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< span class = "md-nav__icon md-icon" > < / span >
Security
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../security/understanding-the-ports/" class = "md-nav__link" >
Understanding the Ports
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< / li >
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< li class = "md-nav__item" >
< a href = "../../security/ssl/" class = "md-nav__link" >
SSL/TLS
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< li class = "md-nav__item" >
< a href = "../../security/fail2ban/" class = "md-nav__link" >
Fail2Ban
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< li class = "md-nav__item" >
< a href = "../../security/mail_crypt/" class = "md-nav__link" >
Mail Encryption
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< / li >
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< li class = "md-nav__item" >
< a href = "../../security/rspamd/" class = "md-nav__link" >
Rspamd
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../debugging/" class = "md-nav__link" >
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Debugging
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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
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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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About setup.sh
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< / a >
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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 " type = "checkbox" id = "__nav_4_8" checked >
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< label class = "md-nav__link" for = "__nav_4_8" id = "__nav_4_8_label" tabindex = "0" >
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Advanced Configuration
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_8_label" aria-expanded = "true" >
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< label class = "md-nav__title" for = "__nav_4_8" >
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< span class = "md-nav__icon md-icon" > < / span >
Advanced Configuration
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../optional-config/" class = "md-nav__link" >
Optional Configuration
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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 md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8_2" >
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< label class = "md-nav__link" for = "__nav_4_8_2" id = "__nav_4_8_2_label" tabindex = "0" >
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Maintenance
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" data-md-level = "3" aria-labelledby = "__nav_4_8_2_label" aria-expanded = "false" >
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< label class = "md-nav__title" for = "__nav_4_8_2" >
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< span class = "md-nav__icon md-icon" > < / span >
Maintenance
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../maintenance/update-and-cleanup/" class = "md-nav__link" >
Update and Cleanup
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< / li >
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< / ul >
< / nav >
< / 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 md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8_3" >
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< label class = "md-nav__link" for = "__nav_4_8_3" id = "__nav_4_8_3_label" tabindex = "0" >
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Override the Default Configs
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" data-md-level = "3" aria-labelledby = "__nav_4_8_3_label" aria-expanded = "false" >
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< label class = "md-nav__title" for = "__nav_4_8_3" >
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< span class = "md-nav__icon md-icon" > < / span >
Override the Default Configs
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../override-defaults/dovecot/" class = "md-nav__link" >
Dovecot
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< / li >
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< li class = "md-nav__item" >
< a href = "../override-defaults/postfix/" class = "md-nav__link" >
Postfix
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< / li >
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< li class = "md-nav__item" >
< a href = "../override-defaults/user-patches/" class = "md-nav__link" >
Modifications via Script
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< / li >
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< / ul >
< / nav >
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< li class = "md-nav__item" >
< a href = "../auth-ldap/" class = "md-nav__link" >
LDAP Authentication
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< / li >
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< li class = "md-nav__item" >
< a href = "../mail-sieve/" class = "md-nav__link" >
Email Filtering with Sieve
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< / li >
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< li class = "md-nav__item" >
< a href = "../mail-fetchmail/" class = "md-nav__link" >
Email Gathering with Fetchmail
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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 md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8_7" >
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< label class = "md-nav__link" for = "__nav_4_8_7" id = "__nav_4_8_7_label" tabindex = "0" >
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Email Forwarding
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" data-md-level = "3" aria-labelledby = "__nav_4_8_7_label" aria-expanded = "false" >
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< label class = "md-nav__title" for = "__nav_4_8_7" >
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< span class = "md-nav__icon md-icon" > < / span >
Email Forwarding
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../mail-forwarding/relay-hosts/" class = "md-nav__link" >
Relay Hosts
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../mail-forwarding/aws-ses/" class = "md-nav__link" >
AWS SES
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< / ul >
< / nav >
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< li class = "md-nav__item" >
< a href = "../full-text-search/" class = "md-nav__link" >
Full-Text Search
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< / li >
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< li class = "md-nav__item" >
< a href = "../kubernetes/" class = "md-nav__link" >
Kubernetes
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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" type = "checkbox" id = "__toc" >
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< label class = "md-nav__link md-nav__link--active" for = "__toc" >
IPv6
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< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
IPv6
< / 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" >
< 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 = "#background" class = "md-nav__link" >
Background
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< h1 > IPv6< / h1 >
< h2 id = "background" > < a class = "toclink" href = "#background" > Background< / a > < / h2 >
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< p > If your container host supports IPv6, then < code > docker-mailserver< / code > will automatically accept IPv6 connections by way of the docker host's IPv6. However, incoming mail will fail SPF checks because they will appear to come from the IPv4 gateway that docker is using to proxy the IPv6 connection (< code > 172.20.0.1< / code > is the gateway).< / p >
< p > This can be solved by supporting IPv6 connections all the way to the < code > docker-mailserver< / code > container.< / p >
< h2 id = "setup-steps" > < a class = "toclink" href = "#setup-steps" > Setup steps< / a > < / h2 >
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< span class = "gu" > @@ ... @@ services:< / span >
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< span class = "gi" > + ipv6nat:< / span >
< span class = "gi" > + image: robbertkl/ipv6nat< / span >
< span class = "gi" > + restart: always< / span >
< span class = "gi" > + network_mode: " host" < / span >
< span class = "gi" > + cap_add:< / span >
< span class = "gi" > + - NET_ADMIN< / span >
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< span class = "gu" > @@ ... @@ networks:< / span >
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< span class = "gi" > + default:< / span >
< span class = "gi" > + driver: bridge< / span >
< span class = "gi" > + enable_ipv6: true< / span >
< span class = "gi" > + ipam:< / span >
< span class = "gi" > + driver: default< / span >
< span class = "gi" > + config:< / span >
< span class = "gi" > + - subnet: fd00:0123:4567::/48< / span >
< span class = "gi" > + gateway: fd00:0123:4567::1< / span >
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< / code > < / pre > < / div >
< h2 id = "further-discussion" > < a class = "toclink" href = "#further-discussion" > Further Discussion< / a > < / h2 >
< p > See < a href = "https://github.com/docker-mailserver/docker-mailserver/issues/1438" > #1438< / a > < / p >
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< p > & copy < a href = "https://github.com/docker-mailserver" > < em > Docker Mailserver Organization< / em > < / a > < br / > < span > This project is licensed under the MIT license.< / span > < / p >
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