This is one of those specific instances where it really, really helps when you
do _not_ have catch-all addresses since the bogus ones will fail. As long as
you can "prove" that your IP address is not in the list (meaning it did not
originate or come through you machine) you can "win" - but it is not easy by
any means and takes work on your part to "drive" them away.
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Except when people are sending mail you one of your customers return address and all the bogus mail comes back to you.
I also have people using mail. plus our domain to send mail. It is really being send from the domain. We do not have a mail.domaininquestion.com BUT all the return and complaints come to me, not the ip sending it. Verizon in phili
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