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Update via Email fails with 550 - How to track down the problem?

I get an error when I submit Blog posts via mail. I have two sites.

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 5.1.1 : Recipient address rejected: (state 13).

How can I fix this?
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