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< meta name = "description" content = "A fullstack but simple mail-server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) using Docker." >
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< title > Advanced | Email Filtering with Sieve - Docker Mailserver< / title >
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Docker Mailserver
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Advanced | Email Filtering with Sieve
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Initializing search
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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 >
< li class = "md-nav__item" >
< 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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< label class = "md-nav__link" for = "__nav_4" id = "__nav_4_label" tabindex = "0" >
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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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< / a >
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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 >
< / 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_3" >
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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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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_3_label" aria-expanded = "false" >
< 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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< / 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_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
< 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_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 >
< / 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 " 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
< / 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
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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
< / 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
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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
< / 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
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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
< / 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
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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" >
Email Filtering with Sieve
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
Email Filtering with Sieve
< / 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 = "#user-defined-sieve-filters" class = "md-nav__link" >
User-Defined Sieve Filters
< / a >
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< / li >
< li class = "md-nav__item" >
< a href = "#automatic-sorting-based-on-subaddresses" class = "md-nav__link" >
Automatic Sorting Based on Subaddresses
< / a >
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< / li >
< li class = "md-nav__item" >
< a href = "#manage-sieve" class = "md-nav__link" >
Manage Sieve
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< / ul >
< / nav >
< / 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--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
< / label >
< 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
< / 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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Kubernetes
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Dovecot Master Accounts
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< / li >
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Basic Installation
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Building your own Docker image
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Forward-Only Mail-Server with LDAP
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Customize IMAP Folders
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< / ul >
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GHCR
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< a href = "#user-defined-sieve-filters" class = "md-nav__link" >
User-Defined Sieve Filters
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Automatic Sorting Based on Subaddresses
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< / li >
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< a href = "#manage-sieve" class = "md-nav__link" >
Manage Sieve
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< h1 > Email Filtering with Sieve< / h1 >
< h2 id = "user-defined-sieve-filters" > < a class = "toclink" href = "#user-defined-sieve-filters" > User-Defined Sieve Filters< / a > < / h2 >
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< p > < a href = "http://sieve.info/" > Sieve< / a > allows to specify filtering rules for incoming emails that allow for example sorting mails into different folders depending on the title of an email.
There are global and user specific filters which are filtering the incoming emails in the following order:< / p >
< ul >
< li > Global-before -> User specific -> Global-after< / li >
< / ul >
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< p > Global filters are applied to EVERY incoming mail for EVERY email address.
To specify a global Sieve filter provide a < code > docker-data/dms/config/before.dovecot.sieve< / code > or a < code > docker-data/dms/config/after.dovecot.sieve< / code > file with your filter rules.
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If any filter in this filtering chain discards an incoming mail, the delivery process will stop as well and the mail will not reach any following filters(e.g. global-before stops an incoming spam mail: The mail will get discarded and a user-specific filter won't get applied.)< / p >
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< p > To specify a user-defined Sieve filter place a < code > .dovecot.sieve< / code > file into a virtual user's mail folder e.g. < code > /var/mail/example.com/user1/.dovecot.sieve< / code > . If this file exists dovecot will apply the filtering rules.< / p >
< p > It's even possible to install a user provided Sieve filter at startup during users setup: simply include a Sieve file in the < code > docker-data/dms/config/< / code > path for each user login that needs a filter. The file name provided should be in the form < code > < user_login> .dovecot.sieve< / code > , so for example for < code > user1@example.com< / code > you should provide a Sieve file named < code > docker-data/dms/config/user1@example.com.dovecot.sieve< / code > .< / p >
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< p > An example of a sieve filter that moves mails to a folder < code > INBOX/spam< / code > depending on the sender address:< / p >
< div class = "admonition example" >
< p class = "admonition-title" > Example< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "kn" > require< / span > < span class = "p" > [< / span > < span class = "s" > " fileinto" < / span > < span class = "p" > ,< / span > < span class = "s" > " reject" < / span > < span class = "p" > ];< / span >
< span class = "nb" > if< / span > < span class = "nb" > address< / span > < span class = "nt" > :contains< / span > < span class = "p" > [< / span > < span class = "s" > " From" < / span > < span class = "p" > ]< / span > < span class = "s" > " spam@spam.com" < / span > < span class = "p" > {< / span >
< span class = "nb" > fileinto< / span > < span class = "s" > " INBOX.spam" < / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span > < span class = "nb" > else< / span > < span class = "p" > {< / span >
< span class = "nb" > keep< / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< / code > < / pre > < / div >
< / div >
< div class = "admonition warning" >
< p class = "admonition-title" > Warning< / p >
< p > That folders have to exist beforehand if sieve should move them.< / p >
< / div >
< p > Another example of a sieve filter that forward mails to a different address:< / p >
< div class = "admonition example" >
< p class = "admonition-title" > Example< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "kn" > require< / span > < span class = "p" > [< / span > < span class = "s" > " copy" < / span > < span class = "p" > ];< / span >
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< span class = "nb" > redirect< / span > < span class = "nt" > :copy< / span > < span class = "s" > " user2@not-example.com" < / span > < span class = "p" > ;< / span >
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< / code > < / pre > < / div >
< / div >
< p > Just forward all incoming emails and do not save them locally:< / p >
< div class = "admonition example" >
< p class = "admonition-title" > Example< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nb" > redirect< / span > < span class = "s" > " user2@not-example.com" < / span > < span class = "p" > ;< / span >
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< / code > < / pre > < / div >
< / div >
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< p > You can also use external programs to filter or pipe (process) messages by adding executable scripts in < code > docker-data/dms/config/sieve-pipe< / code > or < code > docker-data/dms/config/sieve-filter< / code > . This can be used in lieu of a local alias file, for instance to forward an email to a webservice. These programs can then be referenced by filename, by all users. Note that the process running the scripts run as a privileged user. For further information see < a href = "https://wiki.dovecot.org/Pigeonhole/Sieve/Plugins/Pipe" > Dovecot's wiki< / a > .< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "kn" > require< / span > < span class = "p" > [< / span > < span class = "s" > " vnd.dovecot.pipe" < / span > < span class = "p" > ];< / span >
< span class = "err" > pipe< / span > < span class = "s" > " external-program" < / span > < span class = "p" > ;< / span >
< / code > < / pre > < / div >
< p > For more examples or a detailed description of the Sieve language have a look at < a href = "http://sieve.info/examplescripts" > the official site< / a > . Other resources are available on the internet where you can find several < a href = "https://support.tigertech.net/sieve#sieve-example-rules-jmp" > examples< / a > .< / p >
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< h2 id = "automatic-sorting-based-on-subaddresses" > < a class = "toclink" href = "#automatic-sorting-based-on-subaddresses" > Automatic Sorting Based on Subaddresses< / a > < / h2 >
< p > It is possible to sort subaddresses such as < code > user+mailing-lists@example.com< / code > into a corresponding folder (here: < code > INBOX/Mailing-lists< / code > ) automatically.< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "kn" > require< / span > < span class = "p" > [< / span > < span class = "s" > " envelope" < / span > < span class = "p" > ,< / span > < span class = "s" > " fileinto" < / span > < span class = "p" > ,< / span > < span class = "s" > " mailbox" < / span > < span class = "p" > ,< / span > < span class = "s" > " subaddress" < / span > < span class = "p" > ,< / span > < span class = "s" > " variables" < / span > < span class = "p" > ];< / span >
< span class = "nb" > if< / span > < span class = "nb" > envelope< / span > < span class = "nt" > :detail< / span > < span class = "nt" > :matches< / span > < span class = "s" > " to" < / span > < span class = "s" > " *" < / span > < span class = "p" > {< / span >
< span class = "kd" > set< / span > < span class = "nt" > :lower< / span > < span class = "nt" > :upperfirst< / span > < span class = "s" > " tag" < / span > < span class = "s" > " ${1}" < / span > < span class = "p" > ;< / span >
< span class = "nb" > if< / span > < span class = "err" > mailbox< / span > < span class = "nb" > exists< / span > < span class = "s" > " INBOX.${1}" < / span > < span class = "p" > {< / span >
< span class = "nb" > fileinto< / span > < span class = "s" > " INBOX.${1}" < / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span > < span class = "nb" > else< / span > < span class = "p" > {< / span >
< span class = "nb" > fileinto< / span > < span class = "nt" > :create< / span > < span class = "s" > " INBOX.${tag}" < / span > < span class = "p" > ;< / span >
< span class = "p" > }< / span >
< span class = "p" > }< / span >
< / code > < / pre > < / div >
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< h2 id = "manage-sieve" > < a class = "toclink" href = "#manage-sieve" > Manage Sieve< / a > < / h2 >
< p > The < a href = "https://doc.dovecot.org/admin_manual/pigeonhole_managesieve_server/" > Manage Sieve< / a > extension allows users to modify their Sieve script by themselves. The authentication mechanisms are the same as for the main dovecot service. ManageSieve runs on port < code > 4190< / code > and needs to be enabled using the < code > ENABLE_MANAGESIEVE=1< / code > environment variable.< / p >
< div class = "admonition example" >
< p class = "admonition-title" > Example< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "c1" > # docker-compose.yml< / span >
< span class = "nt" > ports< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "p p-Indicator" > -< / span > < span class = "w" > < / span > < span class = "s" > " 4190:4190" < / span >
< span class = "nt" > environment< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "p p-Indicator" > -< / span > < span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > ENABLE_MANAGESIEVE=1< / span >
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< / code > < / pre > < / div >
< / div >
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< p > All user defined sieve scripts that are managed by ManageSieve are stored in the user's home folder in < code > /var/mail/example.com/user1/sieve< / code > . Just one sieve script might be active for a user and is sym-linked to < code > /var/mail/example.com/user1/.dovecot.sieve< / code > automatically.< / p >
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< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
< p > ManageSieve makes sure to not overwrite an existing < code > .dovecot.sieve< / code > file. If a user activates a new sieve script the old one is backuped and moved to the < code > sieve< / code > folder.< / p >
< / div >
< p > The extension is known to work with the following ManageSieve clients:< / p >
< ul >
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< li > < strong > < a href = "https://github.com/thsmi/sieve" > Sieve Editor< / a > < / strong > a portable standalone application based on the former Thunderbird plugin.< / li >
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