I'm currently using an "unknown" user account in SIMS to trap
incorrectly addressed mail and forward it to the postmaster (that
would be me) so it can be dealt with by hand.
Two questions:
(1) A message on this discussion list last month mentioned that the
fact of having an "unknown" user account might trigger one of the
open-relay detection services to flag the email server as
exploitable. Does having an "unknown" account really create a
security problem somehow, or is this basically a flaw in the methods
of the open-relay detection systems?
(2) My "unknown" account is receiving a lot of junk email for a
couple former users of the system, and I would prefer not to see it.
I assume a good way to handle this is to set up an account again for
the former users, discard the mail as it comes in, and set up an
auto-reply with some message like "so and so is no longer here,
please fix your address book, the new address is xxx". Should I try
to emulate a typical "550 user unknown" message? Should I just write
something in plain english, although I think 99% of this junk mail is
automatically generated? Are there any possible pitfalls with this
strategy?
Thanks for advice, -Steve
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