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Docker Mailserver
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Best Practices | SPF
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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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< / 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" >
< a href = "../dmarc/" class = "md-nav__link" >
DMARC
< / 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" >
SPF
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
SPF
< / 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 = "#add-a-spf-record" class = "md-nav__link" >
Add a SPF Record
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#backup-mx-secondary-mx" class = "md-nav__link" >
Backup MX, Secondary MX
< / a >
< / li >
< / ul >
< / nav >
< / 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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< 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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< 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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< li class = "md-nav__item" >
< a href = "../../advanced/auth-ldap/" class = "md-nav__link" >
LDAP Authentication
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/mail-sieve/" class = "md-nav__link" >
Email Filtering with Sieve
< / a >
< / li >
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2021-03-28 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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< 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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< 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
< 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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< h1 > SPF< / h1 >
< p > From < a href = "https://en.wikipedia.org/wiki/Sender_Policy_Framework" > Wikipedia< / a > :< / p >
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< p class = "admonition-title" > Quote< / p >
< p > Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain comes from a host authorized by that domain's administrators. The list of authorized sending hosts for a domain is published in the Domain Name System (DNS) records for that domain in the form of a specially formatted TXT record. Email spam and phishing often use forged "from" addresses, so publishing and checking SPF records can be considered anti-spam techniques.< / p >
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< p > For a more technical review: < a href = "https://github.com/internetstandards/toolbox-wiki/blob/master/SPF-how-to.md" > https://github.com/internetstandards/toolbox-wiki/blob/master/SPF-how-to.md< / a > < / p >
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< h2 id = "add-a-spf-record" > < a class = "toclink" href = "#add-a-spf-record" > Add a SPF Record< / a > < / h2 >
< p > To add a SPF record in your DNS, insert the following line in your DNS zone:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > ; MX record must be declared for SPF to work
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example.com. IN MX 1 mail.example.com.
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; SPF record
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example.com. IN TXT " v=spf1 mx ~all"
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< / code > < / pre > < / div >
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< p > This enables the < em > Softfail< / em > mode for SPF. You could first add this SPF record with a very low TTL.< / p >
< p > < em > SoftFail< / em > is a good setting for getting started and testing, as it lets all email through, with spams tagged as such in the mailbox.< / p >
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< p > After verification, you < em > might< / em > want to change your SPF record to < code > v=spf1 mx -all< / code > so as to enforce the < em > HardFail< / em > policy. See < a href = "http://www.open-spf.org/SPF_Record_Syntax" > http://www.open-spf.org/SPF_Record_Syntax< / a > for more details about SPF policies.< / p >
< p > In any case, increment the SPF record's TTL to its final value.< / p >
< h2 id = "backup-mx-secondary-mx" > < a class = "toclink" href = "#backup-mx-secondary-mx" > Backup MX, Secondary MX< / a > < / h2 >
< p > For whitelisting a IP Address from the SPF test, you can create a config file (see < a href = "https://www.linuxcertif.com/man/5/policyd-spf.conf" > < code > policyd-spf.conf< / code > < / a > ) and mount that file into < code > /etc/postfix-policyd-spf-python/policyd-spf.conf< / code > .< / p >
< p > < strong > Example:< / strong > < / p >
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< p > Create and edit a < code > policyd-spf.conf< / code > file at < code > docker-data/dms/config/postfix-policyd-spf.conf< / code > :< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > debugLevel< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "s" > 1< / span > < span class = "w" > < / span >
< span class = "c1" > #0(only errors)-4(complete data received)< / span > < span class = "w" > < / span >
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< span class = "na" > skip_addresses< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "s" > 127.0.0.0/8,::ffff:127.0.0.0/104,::1< / span > < span class = "w" > < / span >
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< span class = "c1" > # Preferably use IP-Addresses for whitelist lookups:< / span > < span class = "w" > < / span >
< span class = "na" > Whitelist< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "s" > 192.168.0.0/31,192.168.1.0/30< / span > < span class = "w" > < / span >
< span class = "c1" > # Domain_Whitelist = mx1.not-example.com,mx2.not-example.com< / span > < span class = "w" > < / span >
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< p > Then add this line to < code > docker-compose.yml< / code > :< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > volumes< / span > < span class = "p" > :< / span > < span class = "w" > < / span >
< span class = "w" > < / span > < span class = "p p-Indicator" > -< / span > < span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > ./docker-data/dms/config/postfix-policyd-spf.conf:/etc/postfix-policyd-spf-python/policyd-spf.conf< / span > < span class = "w" > < / span >
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