I think it might be easier if you would simply have a conversation with the techy folks at your customers- invite them to configure THEIR system so that either everything from YOUR system is OK no matter what spam status it has (they can route it to bit-bucket or whatever) or turn off the reject-notice function on such messages, and then you won't have to worry about the problem.
Alternatively, just as a point of goofy curiosity, if they don't want your system doing spam filtering for them, why do they even bother having your system in the path for the traffic anyway? Why not just point their MX record straight to their machine? >>> "sacoo sacoo" <[EMAIL PROTECTED]> 8/22/2007 8:10:58 AM >>> Well, maybe I didn't explain it properly we are not providing relay for the outgoing mail, we are only filtering for viruses/spam the incoming mails and the part that are junk of them are the ones bouncing to us and giving problems.