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Usually this happens when a Mac or mac user is who sent or forwarded the message to you. Its usually an issue due to the signature of the forwarding account, whether that signature is added through gmail, or t hrough mac mail, or through outlook for mac.
If you ask the person with the mac to temporarily remove there signature and then send you a test message.. The x msg attachments shouldnt come through. basically, those attachments are the signature file or the picture or logos in the signature file.
If you have further questions, or the above suggestion doesnt work.. Let me know!
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.