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  1. Remember avast scans outbound email so if your email were infected avast should alert and block the sending of it.

  2. Assuming you sent an email that had an infected attachment or link to a malicious web site, the recipient would need to open/run the attachment or click on the link in the email.

So If you and your friend and contacts exercise safe hex, don’t click on links or open attachments in unsolicited emails. Always check never assume because it comes from the email address of a friend that it comes from them, it is so easy to fake who it comes from. Never open an attachment from the email, save it to your hard disk and scan it with avast, you could also scan it at VirusTotal - Multi engine on-line virus scanner if that proves clean you have reasonable confidence that it is OK.