mta

Go implementation for Postfix socketmap table lookup client.

SMTP (email) server with a focus on simplicity, security, and ease of operation [mirror]

spf is an open source implementation of the Sender Policy Framework (SPF) in Go.

It is used by the chasquid and maddy SMTP servers.

Mail header analyzer that checks malicious hostnames (MTAs) via abuseIP API. It also extracts useful information as sender and SPF checks.