I've set up Webmin and Virtualmin on a CentOS 6 dedicated server. Postifx / Dovecot config is untouched by me, and I havent tried to open or close any ports manually.
My problem is that after creating a new virtual host and email users for that host, the new email addresses don't seem to be working.
According to nmap, ports 25 and 110 are open, and the MX record and mail.domain.com A record on my domain are all correct, but incoming email isn't getting to the inbox and I can't connect to the SMTP server using a mail client - connection gets refused on port 25. I seem to be able to log in to the POP server but none of my test emails have come through.
Any ideas on what could be wrong?