On 2020-09-24 12:07, Rick Moen wrote: > I've had no problems _without_ DMARC/DKIM (but with a strongly > asserted SPF record). Have been operating home *ix SMTP smarthosts on > static IP with matching rDNS, and maintaining a clean, high-reputation > system since the 1980s. > > I've tried to always have rDNS always match exactly my main mail > server's primary identity, though it has several valid alternate > public identities (uncle-enzo.linuxmafia.com, hugin.imat.com, > unixmercenary.net) that in my experience _also_ enjoy high reputation, > despite A-to-PTR mismatch. > > Basically, in my experience, some operators may be assigning a _very > small_ spamicity score to 'rDNS exists but doesn't match': I cannot > really tell. What's clear is that 'IP lacks rDNS' is (rightfully) > penalised, given RFC mandate for same and its usefulness as an > antispam heuristic.
FWIW, I check for DNS round trip and passing SPF, and I reject (but not blackhole) when both fail. -- Ian _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng