DavidR
4
It is highly unlikely that you received an infected email from your own computer.
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Avast would have given a warning on the outbound email.
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Your email address is simply in the address book or file on someones computer that is infected.
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Email that is sent from infecetd computers usually has the from address forged, this is usually an address found in the addressbook.
Doing this often bypasses some spam/av programs as your email address is in your white/safe list. I have removed my email address from white lists to ensure that it too is checked. This is more a spam issue as avast doesn’t care who sent the email it checks it.