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Docker Mailserver
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Override the Default Configs | Dovecot
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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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< a href = "../../../.." class = "md-nav__link" >
Home
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< a href = "../../../../introduction/" class = "md-nav__link" >
Introduction
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Usage
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Configuration
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< nav class = "md-nav" data-md-level = "1" aria-labelledby = "__nav_4_label" aria-expanded = "true" >
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< 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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< a href = "../../../environment/" class = "md-nav__link" >
Environment Variables
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< li class = "md-nav__item" >
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< a href = "../../../user-management/" class = "md-nav__link" >
User Management
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< 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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< 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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< a href = "../../../best-practices/dkim_dmarc_spf/" class = "md-nav__link" >
DKIM, DMARC & SPF
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< li class = "md-nav__item" >
< a href = "../../../best-practices/autodiscover/" class = "md-nav__link" >
Auto-discovery
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< / ul >
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< li class = "md-nav__item md-nav__item--nested" >
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< label class = "md-nav__link" for = "__nav_4_4" id = "__nav_4_4_label" tabindex = "0" >
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Security
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< / label >
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_4_label" aria-expanded = "false" >
< label class = "md-nav__title" for = "__nav_4_4" >
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< span class = "md-nav__icon md-icon" > < / span >
Security
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../../security/understanding-the-ports/" class = "md-nav__link" >
Understanding the Ports
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< / li >
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< li class = "md-nav__item" >
< a href = "../../../security/ssl/" class = "md-nav__link" >
SSL/TLS
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< li class = "md-nav__item" >
< a href = "../../../security/fail2ban/" class = "md-nav__link" >
Fail2Ban
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< li class = "md-nav__item" >
< a href = "../../../security/mail_crypt/" class = "md-nav__link" >
Mail Encryption
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< / li >
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< li class = "md-nav__item" >
< a href = "../../../security/rspamd/" class = "md-nav__link" >
Rspamd
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< / ul >
< / nav >
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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 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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< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle " type = "checkbox" id = "__nav_4_8" checked >
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< label class = "md-nav__link" for = "__nav_4_8" id = "__nav_4_8_label" tabindex = "0" >
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Advanced Configuration
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_8_label" aria-expanded = "true" >
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< label class = "md-nav__title" for = "__nav_4_8" >
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< span class = "md-nav__icon md-icon" > < / span >
Advanced Configuration
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../optional-config/" class = "md-nav__link" >
Optional Configuration
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< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8_2" >
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< label class = "md-nav__link" for = "__nav_4_8_2" id = "__nav_4_8_2_label" tabindex = "0" >
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Maintenance
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< / label >
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< nav class = "md-nav" data-md-level = "3" aria-labelledby = "__nav_4_8_2_label" aria-expanded = "false" >
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< label class = "md-nav__title" for = "__nav_4_8_2" >
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< span class = "md-nav__icon md-icon" > < / span >
Maintenance
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
< a href = "../../maintenance/update-and-cleanup/" class = "md-nav__link" >
Update and Cleanup
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< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle " type = "checkbox" id = "__nav_4_8_3" checked >
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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 = "true" >
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< label class = "md-nav__title" for = "__nav_4_8_3" >
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< span class = "md-nav__icon md-icon" > < / span >
Override the Default Configs
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< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item 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" >
Dovecot
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< a href = "./" class = "md-nav__link md-nav__link--active" >
Dovecot
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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
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< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#add-configuration" class = "md-nav__link" >
Add Configuration
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< li class = "md-nav__item" >
< a href = "#override-configuration" class = "md-nav__link" >
Override Configuration
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< / li >
< li class = "md-nav__item" >
< a href = "#debugging" class = "md-nav__link" >
Debugging
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< / ul >
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< / li >
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< li class = "md-nav__item" >
< a href = "../postfix/" class = "md-nav__link" >
Postfix
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< / li >
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< li class = "md-nav__item" >
< a href = "../user-patches/" class = "md-nav__link" >
Modifications via Script
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< / li >
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< / ul >
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< li class = "md-nav__item" >
< a href = "../../auth-ldap/" class = "md-nav__link" >
LDAP Authentication
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< / li >
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< li class = "md-nav__item" >
< a href = "../../mail-sieve/" class = "md-nav__link" >
Email Filtering with Sieve
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< / li >
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< li class = "md-nav__item" >
< a href = "../../mail-fetchmail/" class = "md-nav__link" >
Email Gathering with Fetchmail
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< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8_7" >
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< label class = "md-nav__link" for = "__nav_4_8_7" id = "__nav_4_8_7_label" tabindex = "0" >
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Email Forwarding
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< / 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
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< / li >
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< li class = "md-nav__item" >
< a href = "../../mail-forwarding/aws-ses/" class = "md-nav__link" >
AWS SES
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< / ul >
< / nav >
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< li class = "md-nav__item" >
< a href = "../../full-text-search/" class = "md-nav__link" >
Full-Text Search
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< / li >
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< h1 > Dovecot< / h1 >
< h2 id = "add-configuration" > < a class = "toclink" href = "#add-configuration" > Add Configuration< / a > < / h2 >
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< p > The Dovecot default configuration can easily be extended providing a < code > docker-data/dms/config/dovecot.cf< / code > file.
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< a href = "https://doc.dovecot.org/configuration_manual/" > Dovecot documentation< / a > remains the best place to find configuration options.< / p >
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< p > Your DMS folder structure should look like this example:< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > ├── docker-data/dms/config
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│ ├── dovecot.cf
│ ├── postfix-accounts.cf
│ └── postfix-virtual.cf
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├── compose.yaml
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└── README.md
< / code > < / pre > < / div >
< p > One common option to change is the maximum number of connections per user:< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > mail_max_userip_connections< / span > < span class = "w" > < / span > < span class = "o" > =< / span > < span class = "w" > < / span > < span class = "s" > 100< / span >
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< / code > < / pre > < / div >
< p > Another important option is the < code > default_process_limit< / code > (defaults to < code > 100< / code > ). If high-security mode is enabled you'll need to make sure this count is higher than the maximum number of users that can be logged in simultaneously.< / p >
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< p > This limit is quickly reached if users connect to DMS with multiple end devices.< / p >
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< h2 id = "override-configuration" > < a class = "toclink" href = "#override-configuration" > Override Configuration< / a > < / h2 >
< p > For major configuration changes it’ < code > volumes< / code > key.< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > services< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "nt" > mailserver< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "nt" > volumes< / 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" > ./docker-data/dms/mail-data/:/var/mail/< / 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/dovecot/10-master.conf:/etc/dovecot/conf.d/10-master.conf< / span >
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< / code > < / pre > < / div >
< p > You will first need to obtain the configuration from the running container (< em > where < code > mailserver< / code > is the container name< / em > ):< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > mkdir< span class = "w" > < / span > -p< span class = "w" > < / span > ./docker-data/dms/config/dovecot
docker< span class = "w" > < / span > cp< span class = "w" > < / span > mailserver:/etc/dovecot/conf.d/10-master.conf< span class = "w" > < / span > ./docker-data/dms/config/dovecot/10-master.conf
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< / code > < / pre > < / div >
< h2 id = "debugging" > < a class = "toclink" href = "#debugging" > Debugging< / a > < / h2 >
< p > To debug your dovecot configuration you can use:< / p >
< ul >
< li > This command: < code > ./setup.sh debug login doveconf | grep < some-keyword> < / code > < / li >
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< li > Or: < code > docker exec -it mailserver doveconf | grep < some-keyword> < / code > < / li >
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< / ul >
< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
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< p > < a href = "https://github.com/docker-mailserver/docker-mailserver/blob/master/setup.sh" > < code > setup.sh< / code > < / a > is included in the DMS repository. Make sure to use the one matching your image version release.< / p >
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< / div >
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< p > The file < code > docker-data/dms/config/dovecot.cf< / code > is copied internally to < code > /etc/dovecot/local.conf< / code > . To verify the file content, run:< / p >
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< div class = "highlight" > < pre > < span > < / span > < code > docker< span class = "w" > < / span > < span class = "nb" > exec< / span > < span class = "w" > < / span > -it< span class = "w" > < / span > mailserver< span class = "w" > < / span > cat< span class = "w" > < / span > /etc/dovecot/local.conf
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