Virtual user

[hotdog]

In the normal way,qmail use system user as its user,in other way,
if there is a system user named abc,then he'll automatically get a 
email accont abc@domain; if you want to create a email test@domain,
you must create a system user test.
But you know,system accont will cause many sceurity problem.So I
want to not create system accont for the email only user.but the 
books and faq of qmail have no this ....
Would you please tell me how can I do ?


Thanks.


Reai