Is there a spam check for x-enevelope-to != rcpt-to field

Peter Katzmann p.katzmann at
Mon Apr 21 07:57:50 IST 2008

plenty of spam has always a discrepancy between the  x-enevelope-to 
field and the rcpt-to field.
Sometimes its like a small typo for example joe.smith!= joesmith 
sometimes its totally different like johnford!=joesmith.

So i looked for a long time if there is some filter but didn't find one.
Propably someone on the list here has a hint for me ?

Thanks for any pointer


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