Dnia 10.02.2026 o godz. 02:00:58 Doug via mailop pisze: > > I did that. And now an unfortunate revelation: Microsoft does not > send the 550 message to the user, making it look like I am silently > dropping their email. It's even more anti-user than I thought. > Imagine you're trying to send correspondence, it gets blocked, but > you never find out because Microsoft doesn't tell you!
Are you sure it's not some misconfiguration (or even intentional configuration) on Microsoft user's side that they somehow filter out DSNs ? I have met quite a few email users who - surprisingly to me - treat all non-delivery notifications as some kind of spam or unwanted email (and not as a signal that something went wrong). For them, it's some "technical babble" they totally aren't interested in, and want to just get rid of them as quick as possible. (Of course when they later - sometimes much later - find out that their email didn't reach the recipient, they are genuinely very disappointed why "nobody informed them about that"...) Maybe the user you are corresponding with did similar things, for example he/she marked all such notifications as spam in the past, and now Microsoft doesn't send them to that person? In other case, I just can't imagine that MS does not send DSNs to its users. It basically means that if MS user makes a typo, and sends email to a non-existent address (in an existent domain), he/she doesn't get back the information that the user was invalid??? Last time my workplace email was hosted on MS, we normally received DSNs in such case. But this was over 10 years ago... Or maybe they suppress DSNs only from the servers they are blocking??? -- Regards, Jaroslaw Rafa [email protected] -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub." _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
