I have a vhost with a dedicated IP on my VPS and I noticed that there is no entry for it in master.cf (which I thought Virtualmin took care of) but mail is working and I can telnet SMTP for that dedicated IP so how does Virtualmin manage that with no master.cf smtpd entry for that IP?
I am asking because I am trying to enter a custom SMTP Banner for that IP in master.cf so it matches my PTR for that IP making mail happy and I saw the main entry wasn’t there when I thought it would be.