Postfix + SASL Problem

[Jeff Huang]

   Hi,I Using SASL for My Postfix Authentication.The pwcheck_method is saslauthd.My Postfix works with Virtual domain mode,So the user is id at domain.com,But when I send mail,sasl authentication failed.The log is 
saslauthd[11349]: do_auth         : auth failure: [user=id] [service=smtp] [realm=domain.com] [mech=pam] [reason=PAM auth error]
I want Postfix send user with the full name like id at domain.com to sasl,How I can do it?






Jeff Huang