I have a server that I use for playing around with. I want to set up an email account that is @.com, but the way that SquirrelMail and the mail server is set up, the home folder for the username has to be stored in var/www/squirrelmail, instead of /home. Can I have two users named with different UID's, permissions, groups, etc? I assume that Ubuntu Server will let me, but I'm worried that there could be some side effects/ security flaws. Are there?
That is probably not going to work because the system (the glibc) would resolve the name always to the same entry (probably the first). So it would not make a difference whether the second entry is there or not.