I've started using Webmin and Virtualmin recently for the first time after several years of using Plesk and cPanel. Overall I'm extremely impressed.
For a while I thought I was able to get a good IMAP connection, but now I can't get Dovecot to launch, even on restart. I've been able to get it to launch via SSH, but then it shows as not running in Webmin. I don't even know where to begin with this one, when I check the mail error logs they're blank.
I haven't had much with SMTP either. I believe my ISP is blocking port 25, so I need to open an alternate port. Every solution I've found for this seems to be a solution specific to an individual domain, but I'd really like to find a solution that will open the alternate port for every domain I choose to open on the server.