Release branches

We publish a branch for each NixOS release. Only matching branch versions are supported.

• For NixOS 26.05
  • Use the nixos-26.05 branch
  • Documentation
  • Release notes
• For NixOS unstable
  • Use the main branch
  • Documentation

Features

• Continuous Integration Testing
• Multiple Domains
• Postfix
  • SMTP on port 25
  • Submission TLS on port 465
  • Submission StartTLS on port 587
  • LMTP with Dovecot
  • DANE and MTA-STS validation
  • SMTP TLS Reports (RFC 8460)
• Dovecot
  • Maildir folders
  • IMAP with TLS on port 993
  • POP3 with TLS on port 995
  • IMAP with StartTLS on port 143
  • POP3 with StartTLS on port 110
• Certificates
  • ACME
  • Custom certificates
• Spam Filtering
  • Via Rspamd
• Virus Scanning
  • Via ClamAV
• DKIM Signing
  • Via Rspamd
  • Automatic key generation
  • Multiple selectors per Domain
• User Management
  • Declarative user management
  • Declarative password management
  • LDAP users
• Sieve
  • Allow user defined sieve scripts
  • Moving mails from/to junk trains the Bayes filter
  • ManageSieve support
• User Aliases
  • Regular aliases
  • Catch all aliases
• Improve the Forwarding Experience
  • Sender Rewriting Scheme

In the future

• Automatic client configuration
  • Autoconfig
  • Autodiscovery
  • Mobileconfig
• Improve the Forwarding Experience
  • Support ARC signing with Rspamd
• OpenID Connect
  • Depends on relevant clients adding support, e.g. Thunderbird

Get in touch

• Matrix: #nixos-mailserver:nixos.org
• IRC: #nixos-mailserver on Libera Chat

How to Set Up a 10/10 Mail Server Guide

Check out the Setup Guide in the project's documentation.

For a complete list of options, see in readthedocs.

Development

See the How to Develop SNM documentation page.

Contributors

See the contributor tab

Alternative Implementations

• NixCloud Webservices

Credits

• send mail graphic by tnp_dreamingmao from TheNounProject is licensed under CC BY 3.0
• Logo made with Logomakr.com