One of my e-mail customers is currently on the receiving end of massive amounts of delivery failure notices as a "Nigerian scammer" seems to be using her address as its MAIL FROM field.
A lot of it is marked as spam by the SpamAssassin running on the inbound server (if they include the original message).
I added a manual content filter which removes more of the stuff.
I also temporarily blacklisted a few of the most active sources of bounce emails as they weren't servers any of my customers were likely to exchange actual e-mail with.
That has reduced the amount of spurious delivery failure notices my customer receives, however she's still getting ~1-2 such notices per minute.
Is there anything more I can do to help her get rid of this?