mailserver

Homebrew tap is way out of date, goreleaser should be able to generate a new one. Not sure if it will help with launching Inbucket at boot.

We should not discard errors with _, but handle them accordingly.

All code should handle errors. If there is a solid reason not to do this then document on the line why this is not checked.
Test code is allowed to disregard errors.

Cmail looks really nice :) Thanks for building it, a dockerfile would make deployment significantly easier.