I believe it would help greatly if virtualmin virtual domains owners could have the official list of every entry they must user in mail clients. I'm thinking of: mail server address, list of the usernames, port for IMAP, port for POP3, encryption method, mail server and port for outbound emails.
This "blue skies" suggestion comes as a follow-up to https://forum.virtualmin.com/t/does-virtualmin-keep-a-list-of-the-mail-f... An argument in its favour: when you look at the virtualmin support forums, you'll notice a large number of the cries for help are related to mail problems - clearly, this is a subject in which things don't always work properly. And having an official overview of the basic settings would be a great start to help.
Possible counter-argument (playing devil's advocate): it should be obvious for everyone already, and even if it isn't, mail clients auto-guess the proper settings. My counter to this possible counter-argument: well, yes, but actually, no, the information is only available after a google search, usually. And in every situation when there is a problem with emails, but you cannot tell yet where the problem lies, you end up wondering if you have the proper settings here and there. Having the official go-to overview in virtualmin would allow to either fix the problem, or exclude possible suspects, allowing to solve the problem faster eventually.
I hope my post made sense, Have a good day, Oliver