On 6/16/2023, John Possidente via mailop wrote:
A sender of legally mandated bulk mail who are very conscious of making
sure they're dotting every i and crossing every t (because they're
required to) asked me today whether port 25 pingback is still necessary.
I immediately thought, "Of course not," but on second thought (before
speaking, yay) realized that maybe I'm wrong.
Does anyplace still reject mail from sources that don't answer on port 25?
Do you mean this? https://en.wikipedia.org/wiki/Callback_verification
.. or something else?
--
Denny Watson
Lead Investigator
The Spamhaus Project
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