I've got a legitimate sender, FedEx, sending expected, automated emails, that's
got a missing RDNS PTR record on their sending host. For my config, Postfix
currently rejects is with a 450:
Apr 1 16:22:11 mx postfix/postscreen-internal/smtpd[4947]: NOQUEUE:
reject: RCPT from pvma00055.prod.fedex.com[204.135.8.96]: 450 4.1.8
<prvs=799449d577=w...@edc-widmapp.prod.cloud.fedex.com>: Sender address
rejected: Domain not found;
from=<prvs=799449d577=w...@edc-widmapp.prod.cloud.fedex.com>
to=<u...@example.com> proto=ESMTP helo=<mx26.infosec.fedex.com>
I'd like to reject instead with a 550 (or whatever's the appropriate, but
'permanent' smtp code) -- but _only_ for FedEx servers in their
'*.prod.cloud.fedex.com' subdomains; other errant senders/domains should still
use the 450 default.
I know it's possible; what's the recommended approach here?
A map of some sort, I'm guessing -- what's the correct restriction to use, and
syntax for spec'ing the 550 usage?
