qmail only send a mail to yahoo.com?

rahul zoro <rahul_zoro2000-/[email protected]>
Newsgroups gmane.mail.archives.mail-archive
Message-ID <[email protected]> 
Hi,

I am using qmail server with vpopmail.

My question is:-

Users only send a mail to yahoo.com.

If the user try to send mail like rediffmail.com or aol.com etc. Qmail
server deny all mails only user can send mail to yahoo.com.

Is it possible ?

Thanks


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