I have a situation where some main stream spammer has elected to use my
domain name for a number of their e-mail addresses they send BS out
there as. So I get <gibberish>@dimensionnetworks.com bounce backs at a
very high rate. Postfix denies the connection with a 450 user unknown
response but it doesn't change the fact that it is eating my bandwidth
for no reason. This also causes my log files to grow at a rate of
around 10 lines/second. I get probably on average 1.5 bounces/second.
I can't block the source of these e-mails as they are legitimate mail
servers just bouncing either virus laden, spam filled, or mail destined
for users that don't exist.
It doesn't appear to take much of a toll on my processor, but I have
probably a hundred smtp threads handling this and I'd like to find a way
to avoid it if possible.
Has anyone dealt with this? I don't see how it can be dealt with other
than retiring the domain name, but what kind of %$#@! is that? I guess
I could outsource my mail only and let someone else deal with the
bandwidth...
Any ideas?
Larry
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