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I just disabled the email scanning altogether, but I was hitting an Exchange server and not using IMAP or POP3 with the Outlook client. For non-Exchange related scanning, perhaps this link below may be of assistance, but its more of a general Outlook client assistance with scanning…
https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=842