>As noted on the postfix-users list, the REJECT should be DISCARD due to the
>forged From:.

how would that help?

The msg is rejected, not bounced, by IMGate so the sending MTA, not the 
forged sender, sees the reject (the forged sender would see the bounce).

By rejecting, the forged sender is protected from becoming a joe-job victim.

Len


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