Maybe have a look at mailinabox [1] on your own server, that would actually come close to a proper comparision? Have been running it under Docker for half a year or so and had no real problems so far. Setup is easy enough in comparision with a complete DIY server. Community is fairly active as well.<p>[1] <a href="https:&#x2F;&#x2F;mailinabox.email&#x2F;" rel="nofollow">https:&#x2F;&#x2F;mailinabox.email&#x2F;</a>