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Hi Bob,
Perhaps I am missing something here, but with my Postfix
setup (which is based on two instances of Postfix + amavisd-new + Cyrus),
messages are checked against a user database at the outer postfix, and rejected
during the SMTP connection for invalid recipients, before lmtp/etc. even sees
it. For me, this requires that user logins/authentication be handled
through a MySQL database, but is this an option for you?
It avoids almost all of the backscatter issues... though
may not be the best setup for everyone.
Take care,
Anthony
----- Original Message -----
Sent: Friday, July 13, 2007 10:52
PM
Subject: Method to drop unknown user
messages to black hole
Postfix & Cyrus
Have been finishing off the server
ready for accepting external smtp
connections. No more
fetchmail...
I note that in todays spam environment more and more
administrators are
choosing to black hole any messages with invalid
recipients. In a
standard postfix setup this is pretty easy with
luser_relay. When
however you use lmtp, local delivery really only looks at
/etc/aliases
until it passes through to cyrus.
My first question is
a general one. Do you all choose to send
reject/nonexistent user messages
or just black hole them? Rejecting is
obviously the simplest solution but I
am concerned about being
blacklisted from sending garbage back out. There
are ways of course to
stop backscatter happening but I am also concerned
that there are valid
bounces being created that the (real) sender needs to
know about. I'd
like to hear what your solutions have been.
My
second question is how to you accomplish a black hole with cyrus? I
had
thought that a "global" sieve script would do it but note that this
is user
specific. I see nothing specific in lmtp that points to that either.
I
note this has been discussed previously but I didn't find an
actual
resolution beyond allowing auto mailbox creation!
Thoughts
appreciated
Bob
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