On Tue, May 30, 2017 at 06:48:04PM -0400, Daniel Kahn Gillmor wrote: > > On Tue 2017-05-30 15:09:18 +0300, Yuriy M. Kaminskiy wrote: >> >>> SMTP error from remote mail server after RCPT >>> TO:<[email protected]>: host kerckhoffs.g10code.com >> >>> [217.69.77.222]: 550 Reverse DNS lookup failed for host >> >>> 195.159.176.226. > > fwiw, my messages were recently bouncing from this mailserver too -- > i had to fiddle with some DNS records for my own mail relay to get > kerckhoffs to accept mail. it's possible that the spamfiltering > rules have been tightened up recently, or the DNS resolver has > changed. > > I note that 195.159.176.226 has no PTR record at all. maybe the > gmane folks need to add a reverse DNS record via their hosts at > powertech.no?
It is pretty standard (and IIRC part of the SMTP RFCs) that the forward and reverse DNS records must match. The PTR record does not have to match the hostname, but it does have to resolve to a hostname with an A record pointing back to the IP. That lack of a PTR record for 195.159.176.226 will definitely cause problems with any number of SMTP servers. Regards, Ben
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