virtual users for mail?

[Dead Line]

Hello All,


     I am on FreeBSD 4.8-R, I would like to run on the mail system virtual 
users mail.
     i just dunt want to create a _real_ users on system, and I would prefer 
it virtual for certain domain(s)

     Can someone exaplain what to install by order? can i run it under 
sendmail daemon?

    Thank you.
    Marwan.

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