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Docker Mailserver
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Best Practices | DMARC
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docker-mailserver
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GHCR
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Docker Mailserver
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docker-mailserver
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< / a >
< / li >
< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_3" type = "checkbox" id = "__nav_3" checked >
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< label class = "md-nav__link" for = "__nav_3" >
Configuration
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Configuration" data-md-level = "1" >
< label class = "md-nav__title" for = "__nav_3" >
< span class = "md-nav__icon md-icon" > < / span >
Configuration
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../setup.sh/" class = "md-nav__link" >
Your Best Friend setup.sh
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../environment/" class = "md-nav__link" >
Environment Variables
< / a >
< / 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" data-md-toggle = "__nav_3_3" 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--active md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_3_4" 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 = "../dkim/" class = "md-nav__link" >
DKIM
< / a >
< / li >
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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" >
DMARC
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
DMARC
< / 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 = "#enabling-dmarc" class = "md-nav__link" >
Enabling DMARC
< / a >
< / li >
< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../spf/" class = "md-nav__link" >
SPF
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../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 md-toggle--indeterminate" data-md-toggle = "__nav_3_5" 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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2021-04-18 00:13:06 +00:00
< li class = "md-nav__item" >
< a href = "../../security/mail_crypt/" class = "md-nav__link" >
Mail Encryption
< / a >
< / li >
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2021-04-18 00:13:06 +00:00
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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" data-md-toggle = "__nav_3_6" type = "checkbox" id = "__nav_3_6" checked >
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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--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" 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 = "../../advanced/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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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_3_8_2" type = "checkbox" id = "__nav_3_8_2" checked >
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< label class = "md-nav__link" for = "__nav_3_8_2" >
Maintenance
< span class = "md-nav__icon md-icon" > < / span >
< / 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 = "../../advanced/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 md-toggle--indeterminate" data-md-toggle = "__nav_3_8_3" 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 = "../../advanced/override-defaults/dovecot/" class = "md-nav__link" >
Dovecot
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/override-defaults/postfix/" class = "md-nav__link" >
Postfix
< / a >
< / li >
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2021-04-01 20:45:17 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/override-defaults/user-patches/" class = "md-nav__link" >
Modifications via Script
< / a >
< / li >
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2021-04-01 20:45:17 +00:00
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< / ul >
< / nav >
< / li >
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2021-03-28 12:40:56 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/auth-ldap/" class = "md-nav__link" >
LDAP Authentication
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
2021-03-28 12:40:56 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/mail-sieve/" class = "md-nav__link" >
Email Filtering with Sieve
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
2021-03-28 12:40:56 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/mail-fetchmail/" class = "md-nav__link" >
Email Gathering with Fetchmail
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
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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" 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" >
< a href = "../../advanced/mail-forwarding/relay-hosts/" class = "md-nav__link" >
Relay Hosts
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
2021-03-28 12:40:56 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/mail-forwarding/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 = "../../advanced/full-text-search/" class = "md-nav__link" >
Full-Text Search
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
2021-03-28 12:40:56 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/kubernetes/" class = "md-nav__link" >
Kubernetes
< / a >
< / li >
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2021-09-26 08:38:19 +00:00
2021-03-28 12:40:56 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/ipv6/" class = "md-nav__link" >
IPv6
< / a >
< / li >
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2021-09-19 16:56:20 +00:00
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2021-09-19 16:56:20 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/podman/" class = "md-nav__link" >
Podman
< / a >
< / li >
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2021-09-19 16:56:20 +00:00
2022-05-07 22:28:58 +00:00
< li class = "md-nav__item" >
< a href = "../../advanced/dovecot-master-accounts/" class = "md-nav__link" >
Dovecot Master Accounts
< / 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" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4" 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" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" data-md-toggle = "__nav_4_1" type = "checkbox" id = "__nav_4_1" checked >
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< p > More information at < a href = "https://github.com/internetstandards/toolbox-wiki/blob/master/DMARC-how-to.md" > DMARC Guide< / a > .< / p >
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< p > In < code > docker-mailserver< / code > , DMARC is pre-configured out of the box. The only thing you need to do in order to enable it, is to add new < code > TXT< / code > entry to your DNS.< / p >
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< p > In contrast with < a href = "../dkim/" > DKIM< / a > , the DMARC DNS entry does not require any keys, but merely setting the < a href = "https://github.com/internetstandards/toolbox-wiki/blob/master/DMARC-how-to.md#overview-of-dmarc-configuration-tags" > configuration values< / a > . You can either handcraft the entry by yourself or use one of available generators (like < a href = "https://dmarcguide.globalcyberalliance.org" > this one< / a > ).< / p >
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< p > Typically something like this should be good to start with (< em > don't forget to replace < code > @example.com< / code > to your actual domain< / em > ):< / p >
< div class = "highlight" > < pre > < span > < / span > < code > _dmarc.example.com. IN TXT " v=DMARC1; p=none; rua=mailto:dmarc.report@example.com; ruf=mailto:dmarc.report@example.com; sp=none; ri=86400"
< / code > < / pre > < / div >
< p > Or a bit more strict policies (< em > mind < code > p=quarantine< / code > and < code > sp=quarantine< / code > < / em > ):< / p >
< div class = "highlight" > < pre > < span > < / span > < code > _dmarc IN TXT " v=DMARC1; p=quarantine; rua=mailto:dmarc.report@example.com; ruf=mailto:dmarc.report@example.com; fo=0; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400; sp=quarantine"
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< p > DMARC status is not being displayed instantly in Gmail for instance. If you want to check it directly after DNS entries, you can use some services around the Internet such as from < a href = "https://dmarcguide.globalcyberalliance.org" > Global Cyber Alliance< / a > or < a href = "https://ondmarc.redsift.com" > RedSift< / a > . In other cases, email clients will show "DMARC: PASS" in ~1 day or so.< / p >
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< p > Reference: < a href = "https://github.com/docker-mailserver/docker-mailserver/issues/1511" > #1511< / a > < / p >
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