Sorry for the late answer, but will your SMTP logs show the original IP or the VPS’?

Ok for http trafic, but what about SMTP?

The problem with such a situation is that you have no idea of the origin IP address, as all the requests look like they are coming from your VPS. Did you find a way to restore origin IP in your logs?

Yeah, snappymail is what I found as the best alternative that fitted my criteria (docker install and unified inbox). Quickly checked out Afterlogic webmail lite, but I am not sure if it does unified inbox?

Interested in learning about the wildcard. How do you set up the DNS to accept that?