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OpenDKIM has not been updated in the last 7 years and failed to adopt RFC8463, which introduces Ed25519-SHA256 signatures. It has thereby held back the DKIM ecosystem, which relies on the DNS system to publish its public keys. The DNS system in turn does not handle large record sizes well (see RFC8301), which is why Ed25519 public keys would be preferable, but I'm not sure the ecosystem has caught up, so we stay on the conservative side with RSA for now. Fixes: #203 #210 #279 Obsoletes: !162 !338 Supersedes: !246
Release branches
For each NixOS release, we publish a branch. You then have to use the SNM branch corresponding to your NixOS version.
- For NixOS 24.11
- For NixOS 24.05
- For NixOS unstable
- Use the SNM branch
master
- Documentation
- Use the SNM branch
Features
- Continous Integration Testing
- Multiple Domains
- Postfix
- SMTP on port 25
- Submission TLS on port 465
- Submission StartTLS on port 587
- LMTP with Dovecot
- 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
- 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
In the future
- DKIM Signing
- Allow per domain selectors
- Allow passing DKIM signing keys
- Improve the Forwarding Experience
- User management
- Allow local and LDAP user to coexist
- OpenID Connect
- Depends on relevant clients adding support, e.g. Thunderbird
Get in touch
- Join the Libera Chat IRC channel
#nixos-mailserver
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
Credits
- send mail graphic by tnp_dreamingmao from TheNounProject is licensed under CC BY 3.0
- Logo made with Logomakr.com
Languages
Nix
93.6%
Python
6%
Sieve
0.3%
Shell
0.1%