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Docker Mailserver
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Mail Forwarding | Relay Hosts
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docker-mailserver
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Home
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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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docker-mailserver
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Introduction
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Configuration
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Configuration
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Your Best Friend setup.sh
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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" >
User Management
< span class = "md-nav__icon md-icon" > < / span >
< / 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 >
User Management
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../../user-management/accounts/" class = "md-nav__link" >
Accounts
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../user-management/aliases/" class = "md-nav__link" >
Aliases
< / a >
< / 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" 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" >
Best Practices
< span class = "md-nav__icon md-icon" > < / span >
< / 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 >
Best Practices
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../../best-practices/dkim/" class = "md-nav__link" >
DKIM
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../best-practices/dmarc/" class = "md-nav__link" >
DMARC
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../best-practices/spf/" class = "md-nav__link" >
SPF
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../best-practices/autodiscover/" class = "md-nav__link" >
Auto-discovery
< / a >
< / 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" data-md-toggle = "__nav_3_5" data-md-state = "indeterminate" type = "checkbox" id = "__nav_3_5" checked >
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< label class = "md-nav__link" for = "__nav_3_5" >
Security
< span class = "md-nav__icon md-icon" > < / span >
< / 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 >
Security
< / label >
< 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
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../security/ssl/" class = "md-nav__link" >
SSL/TLS
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../security/fail2ban/" class = "md-nav__link" >
Fail2Ban
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../security/mail_crypt/" class = "md-nav__link" >
Mail Encryption
< / a >
< / 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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< label class = "md-nav__link" for = "__nav_3_6" >
Troubleshooting
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< 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 >
< 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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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../../../pop3/" class = "md-nav__link" >
Mail Delivery with POP3
< / a >
< / 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_8" type = "checkbox" id = "__nav_3_8" checked >
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< label class = "md-nav__link" for = "__nav_3_8" >
Advanced Configuration
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Advanced Configuration" data-md-level = "2" >
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< label class = "md-nav__title" for = "__nav_3_8" >
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< 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 = "../../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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< label class = "md-nav__link" for = "__nav_3_8_2" >
Maintenance
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< / label >
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< nav class = "md-nav" aria-label = "Maintenance" data-md-level = "3" >
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< label class = "md-nav__title" for = "__nav_3_8_2" >
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< 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 = "../../maintenance/update-and-cleanup/" class = "md-nav__link" >
Update and Cleanup
< / a >
< / 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" data-md-toggle = "__nav_3_8_3" data-md-state = "indeterminate" type = "checkbox" id = "__nav_3_8_3" checked >
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< label class = "md-nav__link" for = "__nav_3_8_3" >
Override the Default Configs
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Override the Default Configs" data-md-level = "3" >
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< label class = "md-nav__title" for = "__nav_3_8_3" >
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< 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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< li class = "md-nav__item" >
< a href = "../../override-defaults/dovecot/" class = "md-nav__link" >
Dovecot
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../override-defaults/postfix/" class = "md-nav__link" >
Postfix
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../override-defaults/user-patches/" class = "md-nav__link" >
Modifications via Script
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../../auth-ldap/" class = "md-nav__link" >
LDAP Authentication
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../mail-sieve/" class = "md-nav__link" >
Email Filtering with Sieve
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../mail-fetchmail/" class = "md-nav__link" >
Email Gathering with Fetchmail
< / a >
< / 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_8_7" type = "checkbox" id = "__nav_3_8_7" checked >
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< label class = "md-nav__link" for = "__nav_3_8_7" >
Email Forwarding
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Email Forwarding" data-md-level = "3" >
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< label class = "md-nav__title" for = "__nav_3_8_7" >
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< span class = "md-nav__icon md-icon" > < / span >
Email Forwarding
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item md-nav__item--active" >
< 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" >
Relay Hosts
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
Relay Hosts
< / 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 = "#introduction" class = "md-nav__link" >
Introduction
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#basic-configuration" class = "md-nav__link" >
Basic Configuration
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#advanced-configuration" class = "md-nav__link" >
Advanced Configuration
< / a >
< nav class = "md-nav" aria-label = "Advanced Configuration" >
< ul class = "md-nav__list" >
< li class = "md-nav__item" >
< a href = "#sender-dependent-authentication" class = "md-nav__link" >
Sender-dependent Authentication
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#sender-dependent-relay-host" class = "md-nav__link" >
Sender-dependent Relay Host
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#excluding-sender-domains" class = "md-nav__link" >
Excluding Sender Domains
< / a >
< nav class = "md-nav" aria-label = "Excluding Sender Domains" >
< ul class = "md-nav__list" >
< li class = "md-nav__item" >
< a href = "#references" class = "md-nav__link" >
References
< / a >
< / li >
< / ul >
< / nav >
< / li >
< / ul >
< / nav >
< / li >
< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../aws-ses/" class = "md-nav__link" >
AWS SES
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../../full-text-search/" class = "md-nav__link" >
Full-Text Search
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../kubernetes/" class = "md-nav__link" >
Kubernetes
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../ipv6/" class = "md-nav__link" >
IPv6
< / a >
< / li >
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2021-09-19 16:56:20 +00:00
< li class = "md-nav__item" >
< a href = "../../podman/" class = "md-nav__link" >
Podman
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< / ul >
< / nav >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_4" data-md-state = "indeterminate" type = "checkbox" id = "__nav_4" checked >
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< label class = "md-nav__link" for = "__nav_4" >
Examples
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< 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" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_4_1" data-md-state = "indeterminate" type = "checkbox" id = "__nav_4_1" checked >
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< label class = "md-nav__link" for = "__nav_4_1" >
Tutorials
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< 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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< 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 > Relay Hosts< / h1 >
< h2 id = "introduction" > < a class = "toclink" href = "#introduction" > Introduction< / a > < / h2 >
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< p > Rather than having Postfix deliver mail directly, you can configure Postfix to send mail via another mail relay (smarthost). Examples include < a href = "https://www.mailgun.com/" > Mailgun< / a > , < a href = "https://sendgrid.com/" > Sendgrid< / a > and < a href = "https://aws.amazon.com/ses/" > AWS SES< / a > .< / p >
< p > Depending on the domain of the sender, you may want to send via a different relay, or authenticate in a different way.< / p >
< h2 id = "basic-configuration" > < a class = "toclink" href = "#basic-configuration" > Basic Configuration< / a > < / h2 >
< p > Basic configuration is done via environment variables:< / p >
< ul >
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< li > < code > RELAY_HOST< / code > : < em > default host to relay mail through, < code > empty< / code > (aka '', or no ENV set) will disable this feature< / em > < / li >
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< li > < code > RELAY_PORT< / code > : < em > port on default relay, defaults to port 25< / em > < / li >
< li > < code > RELAY_USER< / code > : < em > username for the default relay< / em > < / li >
< li > < code > RELAY_PASSWORD< / code > : < em > password for the default user< / em > < / li >
< / ul >
< p > Setting these environment variables will cause mail for all sender domains to be routed via the specified host, authenticating with the user/password combination.< / p >
< div class = "admonition warning" >
< p class = "admonition-title" > Warning< / p >
< p > For users of the previous < code > AWS_SES_*< / code > variables: please update your configuration to use these new variables, no other configuration is required.< / p >
< / div >
< h2 id = "advanced-configuration" > < a class = "toclink" href = "#advanced-configuration" > Advanced Configuration< / a > < / h2 >
< h3 id = "sender-dependent-authentication" > < a class = "toclink" href = "#sender-dependent-authentication" > Sender-dependent Authentication< / a > < / h3 >
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< p > Sender dependent authentication is done in < code > docker-data/dms/config/postfix-sasl-password.cf< / code > . You can create this file manually, or use:< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > setup.sh relay add-auth < domain> < username> < span class = "o" > [< / span > < password> < span class = "o" > ]< / span >
< / code > < / pre > < / div >
< p > An example configuration file looks like this:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > @domain1.com relay_user_1:password_1
@domain2.com relay_user_2:password_2
< / code > < / pre > < / div >
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< p > If there is no other configuration, this will cause Postfix to deliver email through the relay specified in < code > RELAY_HOST< / code > env variable, authenticating as < code > relay_user_1< / code > when sent from < code > domain1.com< / code > and authenticating as < code > relay_user_2< / code > when sending from < code > domain2.com< / code > .< / p >
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< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
< p > To activate the configuration you must either restart the container, or you can also trigger an update by modifying a mail account.< / p >
< / div >
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< p > Sender dependent relay hosts are configured in < code > docker-data/dms/config/postfix-relaymap.cf< / code > . You can create this file manually, or use:< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > setup.sh relay add-domain < domain> < host> < span class = "o" > [< / span > < port> < span class = "o" > ]< / span >
< / code > < / pre > < / div >
< p > An example configuration file looks like this:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > @domain1.com [relay1.org]:587
@domain2.com [relay2.org]:2525
< / code > < / pre > < / div >
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< p > Combined with the previous configuration in < code > docker-data/dms/config/postfix-sasl-password.cf< / code > , this will cause Postfix to deliver mail sent from < code > domain1.com< / code > via < code > relay1.org:587< / code > , authenticating as < code > relay_user_1< / code > , and mail sent from < code > domain2.com< / code > via < code > relay2.org:2525< / code > authenticating as < code > relay_user_2< / code > .< / p >
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< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
< p > You still have to define < code > RELAY_HOST< / code > to activate the feature< / p >
< / div >
< h3 id = "excluding-sender-domains" > < a class = "toclink" href = "#excluding-sender-domains" > Excluding Sender Domains< / a > < / h3 >
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< p > If you want mail sent from some domains to be delivered directly, you can exclude them from being delivered via the default relay by adding them to < code > docker-data/dms/config/postfix-relaymap.cf< / code > with no destination. You can also do this via:< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > setup.sh relay exclude-domain < domain>
< / code > < / pre > < / div >
< p > Extending the configuration file from above:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > @domain1.com [relay1.org]:587
@domain2.com [relay2.org]:2525
@domain3.com
< / code > < / pre > < / div >
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< p > This will cause email sent from < code > domain3.com< / code > to be delivered directly.< / p >
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< h4 id = "references" > < a class = "toclink" href = "#references" > References< / a > < / h4 >
< p > Thanks to the author of < a href = "https://community.rackspace.com/products/f/email-products-forum/3897/how-to-setup-postfix-with-a-mailgun-smtp-relay-when-using-multiple-domains" > this article< / a > for the inspiration. This is also worth reading to understand a bit more about how to set up Mailgun to work with this.< / p >
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