DavidR
5
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The avast Mail Shield should automatically setup your accounts info based on that of your Thunderbird email account settings.
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The MS Outlook email client also has its own avast plug-in, which means avast is essentially working from inside Outlook so the scanning happens before/after any encryption/decryption.
At least that is my understanding of the avast plug-in for MS Outlook. Since I don’t use either Outlook or Gmail I can’t test that.