reject_sender_login_mismatch doesnt work

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reject_sender_login_mismatch doesnt work
\ Patrick T. Tsang (30 Nov 2007)
. \ Sahil Tandon (30 Nov 2007)
. \ Patrick T. Tsang (30 Nov 2007)
. . \ MacShane, Tracy (30 Nov 2007)
. . \ mouss (30 Nov 2007)
. \ Patrick T. Tsang (30 Nov 2007)

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Subject:	reject_sender_login_mismatch doesnt work
Group:	Postfix-users
From:	Patrick T. Tsang
Date:	30 Nov 2007

Hello,

To protect our mail gateway from receiving fake office senders, I would like to apply a postfix rejection rule to block spammers.
Since this mail gateway is receving mails from anonymous clients and our SASL users in VPN, I cannot simply apply "reject_sender_login_mismatch".

Other option "reject_unauthenticated_sender_login_mismatch" results the same.
My testing server rejects too many incoming mails because they use postmaster to send out mails.

How should I do?

Thanks
Patrick