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Docker Mailserver
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Security | mail_crypt (email/storage encryption)
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docker-mailserver
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Home
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Introduction
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Configuration
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Examples
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FAQ
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Contributing
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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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< div class = "md-source__repository" >
docker-mailserver
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< ul class = "md-nav__list" data-md-scrollfix >
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< 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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< input class = "md-nav__toggle md-toggle " type = "checkbox" id = "__nav_4" checked >
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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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< li class = "md-nav__item" >
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< a href = "../../user-management/" class = "md-nav__link" >
User Management
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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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< / ul >
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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_4" checked >
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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 = "true" >
< 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 = "../understanding-the-ports/" class = "md-nav__link" >
Understanding the Ports
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< li class = "md-nav__item" >
< a href = "../ssl/" class = "md-nav__link" >
SSL/TLS
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< li class = "md-nav__item" >
< a href = "../fail2ban/" class = "md-nav__link" >
Fail2Ban
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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" >
Mail Encryption
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< a href = "./" class = "md-nav__link md-nav__link--active" >
Mail Encryption
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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" >
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< a href = "#single-encryption-key-global-method" class = "md-nav__link" >
Single Encryption Key / Global Method
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< li class = "md-nav__item" >
< a href = "../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 >
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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 >
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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--nested" >
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< input class = "md-nav__toggle md-toggle md-toggle--indeterminate" type = "checkbox" id = "__nav_4_8" >
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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
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< / label >
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< nav class = "md-nav" data-md-level = "2" aria-labelledby = "__nav_4_8_label" aria-expanded = "false" >
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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 = "../../advanced/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
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< 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
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< / ul >
< / nav >
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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
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< / 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
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< 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
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< / li >
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< li class = "md-nav__item" >
< a href = "../../advanced/override-defaults/postfix/" class = "md-nav__link" >
Postfix
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< li class = "md-nav__item" >
< a href = "../../advanced/override-defaults/user-patches/" class = "md-nav__link" >
Modifications via Script
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< / ul >
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< li class = "md-nav__item" >
< a href = "../../advanced/auth-ldap/" class = "md-nav__link" >
LDAP Authentication
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< li class = "md-nav__item" >
< a href = "../../advanced/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 = "../../advanced/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
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< 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
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< li class = "md-nav__item" >
< a href = "../../advanced/mail-forwarding/aws-ses/" class = "md-nav__link" >
AWS SES
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< / ul >
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< li class = "md-nav__item" >
< a href = "../../advanced/full-text-search/" class = "md-nav__link" >
Full-Text Search
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< / li >
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< h1 > Mail Encryption< / h1 >
< div class = "admonition info" >
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< p class = "admonition-title" > Info< / p >
< p > The Mail crypt plugin is used to secure email messages stored in a Dovecot system. Messages are encrypted before written to storage and decrypted after reading. Both operations are transparent to the user.< / p >
< p > In case of unauthorized access to the storage backend, the messages will, without access to the decryption keys, be unreadable to the offending party.< / p >
< p > There can be a single encryption key for the whole system or each user can have a key of their own. The used cryptographical methods are widely used standards and keys are stored in portable formats, when possible.< / p >
< / div >
< p > Official Dovecot documentation: < a href = "https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/" > https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/< / a > < / p >
< hr / >
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< h2 id = "single-encryption-key-global-method" > < a class = "toclink" href = "#single-encryption-key-global-method" > Single Encryption Key / Global Method< / a > < / h2 >
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< ol >
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< li >
< p > Create < code > 10-custom.conf< / code > and populate it with the following:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > # Enables mail_crypt for all services (imap, pop3, etc)
mail_plugins = $mail_plugins mail_crypt
plugin {
mail_crypt_global_private_key = < /certs/ecprivkey.pem
mail_crypt_global_public_key = < /certs/ecpubkey.pem
mail_crypt_save_version = 2
}
< / code > < / pre > < / div >
< / li >
< li >
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< p > Shutdown your mailserver (< code > docker compose down< / code > )< / p >
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< / li >
< li >
< p > You then need to < a href = "https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#ec-key" > generate your global EC key< / a > . We named them < code > /certs/ecprivkey.pem< / code > and < code > /certs/ecpubkey.pem< / code > in step #1.< / p >
< / li >
< li >
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< p > The EC key needs to be available in the container. I prefer to mount a /certs directory into the container:
< 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" > image< / span > < span class = "p" > :< / span > < span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > ghcr.io/docker-mailserver/docker-mailserver:latest< / span >
< span class = "w" > < / span > < span class = "nt" > volumes< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > - ./certs/:/certs< / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span >
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< li >
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< p > While you're editing the < code > compose.yaml< / code > , add the configuration file:
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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" > image< / span > < span class = "p" > :< / span > < span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > ghcr.io/docker-mailserver/docker-mailserver:latest< / span >
< span class = "w" > < / span > < span class = "nt" > volumes< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > - ./config/dovecot/10-custom.conf:/etc/dovecot/conf.d/10-custom.conf< / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > - ./certs/:/certs< / span >
< span class = "w" > < / span > < span class = "l l-Scalar l-Scalar-Plain" > . . .< / span >
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< / code > < / pre > < / div > < / p >
< / li >
< li >
< p > Start the container, monitor the logs for any errors, send yourself a message, and then confirm the file on disk is encrypted:
< div class = "highlight" > < pre > < span > < / span > < code > [root@ip-XXXXXXXXXX ~]# cat -A /mnt/efs-us-west-2/maildata/awesomesite.com/me/cur/1623989305.M6v<36> z<EFBFBD> @<40> <> m}<7D> <> ,<2C> <> 9<EFBFBD> <39> <EFBFBD> <EFBFBD> B*<2A> 247.us-west-2.compute.inE<6E> <45> \Ck*<2A> @7795,W=7947:2,
T<EFBFBD> 9<EFBFBD> 8t<EFBFBD> 6<EFBFBD> <EFBFBD> t<> <74> <EFBFBD> e<EFBFBD> W<EFBFBD> <57> S `<60> H<EFBFBD> <48> C<EFBFBD> ڤ <20> yeY<65> <59> XZ<58> <5A> ^<5E> d<EFBFBD> /<2F> <> +<2B> A
< / code > < / pre > < / div > < / p >
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< / li >
< / ol >
< p > This should be the minimum required for encryption of the mail while in storage.< / p >
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< / body >
< / html >
