User creation problem

[Julian_Lopez]

First, sorry for my english :D

I dont know if this is a problem of my mail server configuration or no.

I just install ispconfig in my server. I created a user in a domain (domain.com) called julius. when I use outlook for check email i had to put in user log in only "julius".
How can i change the way to login to julius@domain.com instead only julius.

note: when i am creating a new user i cant put julius@domain.com, a msg appears:

Field: Username
The user name has to contain a minimum of 4 and a maximum of 32 letters or figures and has to begin with a letter.

I use postfix for email server.
thanks a lot for read this. I know is very difucult explain me ;)

[falko]

You cannot use email addresses as usernames in ISPConfig 2. ISPConfig 2 configures system users, and Linux doesn't allow "@" in usernames.

[Julian_Lopez]

You cannot use email addresses as usernames in ISPConfig 2. ISPConfig 2 configures system users, and Linux doesn't allow "@" in usernames.

But, the promem is when a log into squirremail, Its probably there are two or more users with the same same in diferents domains. How I can To distinguish them.

Thanks a lot for response.

[falko]

That'S why ISPConfig 2 is using username prefixes by default: http://www.howtoforge.com/faq/14_47_en.html