Email, Exchange Server 2007,

mapalaska2003 used Ask the Experts™
Having intermittent problems receiving email from particular address's. For example, the recipient has successfully received email from an individual on 3/16 but not on 3/30. "550 5.7.1 Missing purported responsible address"

Ideas?   Thanks.

Exchange Server 2007
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"Batchelor", Developer and EE Topic Advisor
Top Expert 2015
That message tells that the FROM in the mail header is malformed (non-RFC), and there is a strict check involved (e.g. for SPAM detection). Compare the email headers of both mails to see if there is a difference in FROM.
For valid formats, the formal definition is here, but is certainly a better read ;-).

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