I was playing with new toys in most recent virtualmin. tried this url:
got this response:
correct user name for this account on this server is "steve". This server was set up long ago when we only had one domain on it so we could use the "name" format instead of "firstname.lastname@example.org" format. We plan on migrating to "email@example.com" soon so bug doesn't really impact us, but I figured you would like to know it fails on the "name" formats on a FreeBSD server.