Hi folks,
I'm looking for a way to "switch off" the requirement that
remote SMTP servers have IP addresses which reverse-resolve,
preferably on a per-address or per-network basis.
Personally, I *like* this "feature" of Exim - I don't think
a correctly configured network will *have* SMTP servers with
IP's that don't resolve, and if someone doesn't do what it
takes to configure their network correctly, I don't think
they have any right to complain if other people's networks
or Well Known Services tend to "blow them off."
I don't, though, really think that this requirement can be
given the credit for blocking a lot of unwanted mail - most
of the spam our server drops (as much as 50% of the total
mail received in a given day) is rejected on the basis of
other configuration options.
The real problem, though, is that my boss's *wife* has an
SMTP server where she works, on a network which of course
has not been set up "right," and therefore, whenever she
tries to mail her husband (my boss), our mailserver refuses
to accept her mail.
Thus, in the interest of preserving what marital bliss they
have left... :)
I'm also considering kludging things by creating bogus
reverse-resolution lists on our own nameserver, but I have
a feeling that if I did that, I'd need to either list the
entire netblock (which I have no plan to do) or put the
responsible nameserver (if there is one) in our nameserver's
list of "forwarders" to ask when it can't find something
itself.
Any suggestions?
-Dan
--
Dan Birchall - Internet Sysadmin, 16 Straight Communications
520 Fellowship Road, Suite A-112, Mount Laurel NJ 08054-3400
djb@???, (609) 231-7887, (888) 416-7878, NIC: DJB
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