Backscatter and patching

[sbx]

I am trying to reduce backscatter by adding in a patch to reject mail before it enters the queue if the email address is not a valid one (ie not in my recipents list) ... I am trying to use the patch as found here - http://www3.sympatico.ca/humungusfungus/code/validrcptto.html which as far as I can tell is roughly the same as the badrcptto patch but does the opposite thing ... ie you dont have to add who you want to reject .. you can just reject on the basis that the user does not exist ... I have tried editing the Makefile and qmail-smtpd.c but it does not like it with the big patch given on this site .. and yes I dont program in C .. I am just a dumb dumb ... is there any advice or can the siteadmin add in this useful functionality to the release (.. pretty please :-)) ... or can someone post a patch which will work with QMR .... as it does just about everything else ...

Ideally QMR would include the validrcptto / badrcptto and tarpitting ... but I specifically only need the validrcptto ...

cheers for reading ...

Kevin