On Wed, 17 Sep 2003, James Tyson wrote:
Or in the spec.txt file that comes with most Exim packages.
The condition quite simply uses the lookup expansion
via dnsdb to look
up the a record for $sender_address_domain (ie the domain name of the
sender address). If there is a successful lookup it returns the value
of the lookup (ie the resolved address) or simply an empty string if
the lookup failed (this stops exim throwing an error). It then
compares the result with the string "126.96.36.199". If they match it
returns true, and thus the ACL declines the message, otherwise false.
Ah yes, I see now. Many thanks. I was wondering about the empty string.
Very useful, good work.