> On Feb 20, 2026, at 09:43, Benoît Panizzon via mailop <[email protected]> > wrote: > > So obviously outlook just send the three commands: ehlo, startls and quit but > never transmit the email.
I see this behavior on my server as well. I've contacted Microsoft about it but I haven't received a definitive answer as to why, leaving me to guess that this is part of their liveness/reachability probes. > The sender is never getting a notification (issue persists for one week now) > about emails not being transmitted. For me, these (imo) liveness probes are benign, and I can still send and receive email to Microsoft/Outlook inboxes. -- Alex _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
