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by mikece 766 days ago
"550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons)"

https://en.wikipedia.org/wiki/List_of_SMTP_server_return_cod...

I imagine the "-5.7.1" is an in-house reference by the Virginia IT folks.
2 comments
jabroni_salad 766 days ago
5.7.1 is the response code Exchange uses any time a policy blocks a message. If they are using Exchange then they set it up with a mail flow rule action of 'block the message / reject the message and include an explanation'.
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number6 765 days ago
Am I the only one who thinks this is really thoughtful. Even the error message is good. Brilliant
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taneliv 766 days ago
Those are managed by IANA: https://www.iana.org/assignments/smtp-enhanced-status-codes/... and X.7.1 reads out:

"Delivery not authorized, message refused" and "The sender is not authorized to send to the destination. This can be the result of per-host or per-recipient filtering. This memo does not discuss the merits of any such filtering, but provides a mechanism to report such. This is useful only as a permanent error."

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