Hiya, Lately, we're seeing a lot of mail from us (FastMail) being accepted by Outlook[.com], but then never reaching its destination inbox. It's not in a junk folder or somewhere else. It seems like Outlook is accepting the mail and then dropping it on the floor somewhere. Obviously, this isn't great for out users.
Here's an example SMTP interaction between us and Outlook: > 2019-03-29T09:44:11-04:00 gateway2 postfix-out/smtp[3294666]: A421222096: > to=<operatester...@outlook.com>, > relay=outlook-com.olc.protection.outlook.com[104.47.1.33]:25, delay=2.3, > delays=0.05/0/0.69/1.5, dsn=2.6.0, status=sent (250 2.6.0 > <c6883afe-2d47-40b2-be0d-73b897c7f...@beta.fastmail.com> > [InternalId=18708877624108, > Hostname=VE1EUR01HT199.eop-EUR01.prod.protection.outlook.com] 10961 bytes in > 0.465, 23.013 KB/sec Queued mail for delivery -> 250 2.1.5) We've filed a ticket, but I don't think we've had any response, and it's a scary problem, since we can't detect anything to tell users. Anybody know what can cause this behavior? -- Ricardo Signes (rjbs) Postmaster, FastMail
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