In access(5), the documentation says (in regard to HOST NAME/ADDRESS
PATTERNS):
domain.tld
Matches domain.tld.
However it fails to indicate what this actually *means*. This seems to
be a bit of a documentation failure. Which one of the following is it?
(a) Match an IP address whose reverse DNS matches 'domain.tld'.
(b) (a), with a subsequent forward-lookup to check it isn't a fake
reverse DNS entry.
(c) Match an IP address which is listed as one of the results for an
A-record lookup of 'doman.tld'.
(d) Something else.
I have a situation where I have a DNS record 'foo.example.com', which
resolves to multiple A records. I want to allow mail transactions if
and only if the incoming connection is from one of those IP addresses.
Is this possible with Postfix, and if so, how?
