[dirkc]

I use https://github.com/maildev/maildev, they have a docker image that I run as part of my local dev setup

[tijn]

It seems like almost everyone has written an SMTP server; I use https://github.com/tijn/devmail which has no web interface but a POP server. This is by design so you can see your mail in an actual mail client like Apple's Mail.app or Thunderbird.