My system has been working fine with the following configuration.
POP3 over SSL on port 995 SMTP on port 25
Still works fine this way.
ISSUE #1 However, I've been having some issues using my SmartPhone to connect to the email system (issue is due to .pem vs .cer file types and compatibility with SmartPhone mail system, not Virtualmin/webmin!)
So, to provide a temporary fix, I wanted to connect via POP3 on port 110. It wouldn't work. So I tried it on my laptop with M$ Outlook 2007. It just continually asks for my username and password.
The WEBMIN>DOVECOT>NETWORKING AND PROTOCOLS shows that IMAP, POP3, IMAP (SSL) and POP (SSL) are enabled.
Remember, it works just fine with POP3 (SSL) on port 995!
ISSUE #2 In OUTLOOK>ACCOUNT SETTINGS>EMAIL>MORE SETTINGS>ADVANCED
If I try to use SMTP (SSL) on port 465 I get an error stating "...Outlook, cannot connect to your outgoing (SMTP) e-mail server. If you continue to receive this message, contact your server administrator..."
I get the same error if I use SMTP (SSL) on port 465 and choose SSL for the "Use the following type of encrypted connection:"
I tried using SMTP on port 25 and chose SSL for the "Use the following type of encrypted connection:" This selection gives me a slightly different error stating "...Your server does not support the connection encryption type you have selected..."
In either situation, I don't know what I'm missing!