We have a SBS 2003 SP2 box at office with updated Exchange. Since past few days whenever try sending any email with attachment more than 1Mb, we get a 4.4.7 delay report and a failure report after a day or two. No matter we send the mail via DNS or via our ISP, result is same.
I thought it could be the Antivirus or anti-spam software on the receiving servers but why only with attachment more than 1 MB in size? Any idea?
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