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Email failed to deliver to certain domains with an SMTP protocol error occurred message

December 13, 2009January 24, 2023 Kent ChenMicrosoft

It happened lately in my office that emails sent to certain domains first got delayed and then failed with a SMTP error code 4.4.7 in the final NDR. Error code 4.4.7 usually indicates that the message in the queue has expired and usually the problem is on the receiving server. However, that is obviously not the case this time. Also […]

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