Thanks everyone. This has both clarified the question and answered it (them).
Mike: Yes, 'host' is the term I should have used. Denny: That very well might be what the mailer was referring to. I'll read up on it before answering them John On Mon, Jun 19, 2023 at 8:46 AM Denny Watson via mailop <mailop@mailop.org> wrote: > 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 > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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