dar...@chaosreigns.com wrote:
I see there's a RDNS_NONE rule for when the sending IP address has no DNS PTR (reverse DNS) record. But no rule for when that PTR record doesn't have a matching A (forward DNS) record that matches the sending IP?
Is this something that would be accepted into spamassassin if I created a module? Or a feature that would be added if I didn't do it?
There are legit mail servers with bad DNS. Not the big ISPs or hosting companies, but small businesses and nonprofits sometimes get this wrong, and in a few countries nonmatching records seem to be routine. We've considered blocking for it, but we'd end up doing a lot of whitelisting and interfering with mail that our users want. It's worth scoring for, and RDNS_NONE already matches this case. Joseph Brennan Lead Email Systems Engineer Columbia University Information Technology
