If you have existing users in your Virtualmin account, by default, usernames used to access email via pop3/imap are created with a username.domain convention. If you want to change the username convention to name@domainname.tld there are a couple of issues that you may encounter. Unknown user problem <username.domainname@hostname> (expanded from <name@domainname.tld>): unknown user: “username.domainname” User unknown in virtualread more