chasquid

chasquid is an SMTP (email) server.

It aims to be easy to configure and maintain for a small mail server, at the expense of flexibility and functionality.

It's written in Go.

Features

• Easy to configure, hard to mis-configure in ways that are harmful or insecure (e.g. no open relay, clear-text authentication, etc.).
• Tracking of per-domain TLS support, prevents connection downgrading.
• SMTP UTF8 (international usernames).
• IDNA (international domain names).
• Hooks for easy integration with greylisting, anti-virus and anti-spam.
• Multiple domains, with per-domain user database and aliases.
• Multiple TLS certificates.
• Suffix dropping (user+something@domain -> user@domain).
• Easy integration with letsencrypt.
• SPF checking.
• Monitoring HTTP server, with exported variables and tracing to help debugging.
• Using dovecot for authentication (experimental).

The following are intentionally not implemented:

• Custom email routing and transport.
• DKIM/DMARC checking (although the post-data hook can be used for it).

Status

chasquid is in beta.

It's functional and has had some production exposure, but some things may still change in backwards-incompatible way, including the configuration format. It should be rare and will be avoided if possible.

You should subscribe to the mailing list to get notifications of such changes.

Contact

If you have any questions, comments or patches please send them to the mailing list, chasquid@googlegroups.com.

To subscribe, send an email to chasquid+subscribe@googlegroups.com.

You can also browse the archives.

Documentation

Check out the how-to or the installation guide for more details on how to install and configure chasquid.