Speaking of spam

I have one domain that generates a dozen or so bounce messages to the 
postmaster each day from spam, usually addressed TO legitimate addresses in 
that domain.  I'm not sure exactly what these are, maybe they're attempts to 
bounce the spam back to illegitimate origins.

Thing is, it's only that one domain, out of a half dozen or so on the same 
server.

Any guesses what's going on here?


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