In article <CABa8R6txLmPrVSbVXzQBM+UB=fx6tdlv_ebpalps1q1ktvh...@mail.gmail.com> 
you write:
>I'm confused, the first post said valid credentials, is that what everyone
>else is seeing?
>
>Nearly all valid creds seems weirder than mostly invalid... modulo whatever
>amount of hijacked or reused creds there are.

Remember that Outlook does account consolidation like Gmail does, and
outgoing mail for a consolidated address usually goes through the
account's own server to make it more DMARC-y.

It's not surprising that Outlook would be doing valid SMTP AUTH, but you would
expect it to send a message after it does so.

R's,
John

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