On 2024-02-19 04:46, Gellner, Oliver via mailop wrote:
On 16.02.2024 at 03:38 Matt Palmer via mailop wrote:
Although I must say that
without reverse DNS
would seem to be the easier blocking option -- when was the last time you saw
legitimate mail from an IP without rDNS?
Unfortunately every day. It's true that 99% of legitimate senders have a fully
confirmed reverse DNS, but it's the same as with DMARC, TLS and other
technologies and best practices: To make it a requirement and unconditionally
block all messages from the remaining 1%, the big email services providers need
to make the first step in a coordinated procedure. Otherwise the sender is
unlikely going to fix his setup and rather blame the receiver, because
obviously he can deliver his emails everywhere, just not to our place.
Some of the big guys have been rejecting for a long time.. I think Yahoo
was one of the first big guys to reject connections from IPs with no PTR..
--
BR Oliver
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