Daniel Kahn Gillmor
dkg at fifthhorseman.net
Wed May 31 03:27:30 CEST 2017
On Wed 2017-05-31 10:02:16 +1000, Ben McGinnes wrote:
> 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 188.8.131.52 will definitely cause
> problems with any number of SMTP servers.
i'm aware of this common convention (without commenting on how useful it
is at actually defeating spammers), but i'm surprised to see it
happening with two mail servers that both have sent messages to GnuPG
mailing lists in the not-too-distant past. it's possible that both of
those mailservers have changed at the same time, i guess. there
certainly was a recent change for my own mail relay.
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