It's likely to be this...
1) Someone (now to be know as clueless) else has you in their address book without any AV.
2) Clueless gets infected with a virus that randomly chooses from and to addresses and sends it's self out. But uses clueless's address as the envelope from so every dam locally configured relay will process the mail.
3) Clueless's virus pick you for both the (fake)sender and the recipient.
4) you get the virus, and your av catches it.
Simple innit' ?
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