At 16.47 09/05/2006, you wrote:
Easiest thing to do is add a .qmail file in the postmaster directory stating '|/bin/true delete' to scrap the message [just sets it as deleted by default].

Now I'd imagine the main frontline you'd want to investigate is chkuser.c if you use it. By line 567, it's got a user and domain split. Under case 10, it actually does the user check, so just have it test the user for 'postmaster' and return a failed 'user does not exist'.

It could be more easy to set the BOUNCE_FLAG on for each postmaster, and message will be rejected.


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