Guys, I'm not sure if this is a bug or configuration issue on our end.
I setup a new domain in virtualmin and created several user accounts and several aliases. One of the users (jenny@) had the aliases abuse@ postmaster@ and webmaster@ forwarding to her account.
When we log into webmail as jenny@ the user displayed in the upper left-hand corner of the screen shows webmaster@. I removed the webmaster@ alias and her account showed postmaster@. So I removed all 3 aliases and webmail now shows the correct username (jenny@) in the upper left-hand corner.
As a test I set the webmaster@ alias to a different user jenilee@ and logged into her webmail account - it showed webmaster@ in the upper left-hand corner.
As a temporary solution I've set all 3 aliases to my address so their mail accounts work correctly. Is there a configuration setting I need to edit to sort this out?