Have you got OneCare set up to scan outgoing attachments?
I regret I do not use it so I cannot help on how to find out but my own anti virus program is switchable to turn off the attachment scan for out going mail.
AMD Ryzen news - release date, UK price, features and specifications
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Best value Mac: Which is the best £1249 Mac to buy
Comment faire des captures d’écran sous Windows 10 ?