Suggest an alternative to

Qmail

Bind to different local ip addresses depending on the domain part of the sender argument when using `qmail-remote`.

Why do you think that https://github.com/svarshavchik/courier is a good alternative to Qmail

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with Qmail. Optional.

A valid email to send you a verification link when necessary or log in.