550 Mailbox not found

When an SMTP mail server responds to an attempted email delivery with:

550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons)
This message (or similar variation thereof) indicates that the email recipient cannot be found by the mail server.

This is a permanent error, you should not attempt to retry the delivery to the same address.

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Ninja Tip: trace* will match traceroute.

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