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That sounds a bit strange. What type of email account is it (POP, IMAP, ActiveSync)? If it's an ActiveSync account, do you know if there's any policy set on the server regarding email size?
So it seems it happens with this specific email only?
What happens if you download the attachements in this email using another client and then send them in a new email to yourself? Is our client able to download the attachments from the new email?