system
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Don’t run IMAP accounts myself, but am using Thunderbird 0.7.2 quite happily with Avast!
Nevertheless, a couple of suggestions you may want to try:
- double-click the “a” icon in your task bar to get the On-access protection control panel
- click on “Internet Mail” and check that the provider is running
- click “Customize…”
- go to the IMAP tab
- make sure “Scan inbound mail” and “Insert note into clean message” are both checked
- go to the “Advanced” tab
- make sure “show detailed info on performed action” is checked. This way, every mail that is scanned will bring up a small info banner at the bottom of your screen. If you’re receiving e-mails and this banner doesn’t show, they aren’t getting scanned by Avast!
If you still think your inbound IMAP mails aren’t being scanned, try e-mailing yourself the EICAR test file. It contains a test (but totally harmless) virus which Avast! should pick up when it scans the mail. Go to http://www.eicar.org/anti_virus_test_file.htm … but please be aware that you’d need to temporarily allow Avast! to send infected files (SMTP tab, “allow sending of infected mails”)
Good luck. Let us know what happens.