Am 16.06.23 um 19:37 schrieb John Possidente via mailop:
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?
Thanks.
Since mail operators do all kinds of reasonable and unreasonable things to limit the amount of undesired mail, it's
entirely possible.
I would not care about the domain of the sending SMTP client, but the RFC2821.mailfrom (envelope sender) and the
RFC2822.from (header From: address) tend to be used as recipients of automatic respectively manual responses, and in my
opinion the willingness to receive and handle both kinds of responses is part of good e-mail hygiene.
Cheers,
Hans-Martin
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