chasquid 0.04+git20180302.0ae5798-1 (armhf binary) in ubuntu cosmic

 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, and is open source under the Apache license 2.0.
 .
 It is currently in beta: it's functional and has had some production exposure,
 but some things may still change in backwards-incompatible ways, including the
 configuration format. It should be rare and will be avoided if possible.