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Not only is AOL using non-standard ports when fetching mail via AOL - but the messages are not in standard format. I’ve tried adding the ports for Avast to watch, but it doesn’t seem that they recognize the email - so whatever Avast is keying on - (headers / protocol handshakes etc) to recognize email, AOL doesn’t use it or its encrypted ;D
If your friend uses a standard client for his AOL email (IMAP and SMTP), Avast will work fine. Either way that he gets his mail, they will have already been scanned by mcafee before they hit his inbox.