how to create user@primary.com as user login name?

[sam wun]

Hi,

I use cyrus-imapd2.2 with sasl2 in FreeBSD 5.3.
I have a problem with creating user at primary.com as user name in cyrus.
When user at primary.com created by cyrus and password created by 
saslpasswd2, user at primary.com cant login to cyrus imap server.
But if I create "user" as login name, I can login "user" with the 
password created by saslpasswd2.
primary.com is the default domain defined in imapd.conf.
If I create user at virtualdomain.com as login name, this login name can be 
used for authtentication.

Now the problem is how to create a user with default(primary) domain 
name as login name for cyrus?

Your help is highly appreciated.
Thanks
Sam

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