.jpgs appear corrupt in Mail 5.2 but never on iPhone

Hi guys, I have a weird problem and have searched but not found an answer.
Occasional emails that arrive on my Mac Pro or MacBook Pro Mail 5.2 apear coorupted on one device, but not on the other, and never on my iPhone.
the corruption displays itself as a jpg image that is grey on one section, and it also appears on the downloaded attactment as well as the remotly loaded image in the email itself. Whilst this email may be corrupt on my desktop, its fine on my laptop, and visa vera on other emails. The iphone mail always loads it right.
Im on imap email via an exchange server, I have rebuilt the email and it still tends to occur, I note it doesnt not happen on my icloud email.
Is there a way to force an individual email to reload the attachments?

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