[mirror] SMTP (email) server
Switch branches/tags
Nothing to show
Clone or download



chasquid is an SMTP (email) server with a focus on simplicity, security, and ease of operation.

It's written in Go, and distributed under the Apache license 2.0.

Travis-CI build status Go Report Card Coverage Status GoDoc Freenode


  • Easy
    • Easy to configure.
    • Hard to mis-configure in ways that are harmful or insecure (e.g. no open relay, or clear-text authentication).
    • Monitoring HTTP server, with exported variables and tracing to help debugging.
    • Integrated with Debian and Ubuntu.
    • Supports using Dovecot for authentication.
  • Useful
    • Multiple/virtual domains, with per-domain users and aliases.
    • Suffix dropping (user+something@domainuser@domain).
    • Hooks for integration with greylisting, anti-virus, anti-spam, and DKIM/DMARC.
    • International usernames (SMTPUTF8) and domain names (IDNA).
  • Secure
    • Tracking of per-domain TLS support, prevents connection downgrading.
    • Multiple TLS certificates.
    • Easy integration with Let's Encrypt.
    • SPF and MTA-STS checking.


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 can subscribe to the mailing list to get notifications of such changes, which are also documented in the UPGRADING file.


The Debian+Dovecot+chasquid how-to and the installation guide are the best starting points on how to install, configure and run chasquid.


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 reach out via IRC, #chasquid on freenode.