Sources or hosts? I don’t expect a given host to answer on port 25 just because it sends, but the domain in the return path should be accepting mail properly. If they can’t be bothered to receive their DSNs then they are not likely a good-faith sender.
Mike From: mailop <mailop-boun...@mailop.org> On Behalf Of John Possidente via mailop Sent: Friday, June 16, 2023 1:37 PM To: mailop <mailop@mailop.org> Subject: [mailop] Port 25 Pingback? 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.
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