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Error: SMTPIN_ADDED_BROKEN@mx.google.com

Some times we see the below in the email header information. SMTPIN_ADDED_BROKEN@mx.google.com

The cause of the "...SMTPIN_ADDED_BROKEN@mx.google.com" is because of the 'https://' in the original Message-ID, which is not allowed. There could be some dodo systems which might be doing this and they would need to be tweaked to now allow message-id (see my earlier posts on what it means) and to have https!