I have checked the Internet for a solution for this problem, tried a few, but none works.
I recently bought a new Windows 10 Home computer for my wife and installed Outlook as part of our Office 365 subscription. The new computer came with McAfee LifeSave Antivirus/Firewall. Whenever my wife opens Outlook, the following message appears:
After she clicks on "Yes" everything works fine, but the pop-up message is annoying. I temporarily disabled McAfee, but the error persisted. On her previous computer with Windows 10 Home, the problem did not appear.
Her IMAP connection uses port 993 SSL/TLS encryption.
Her SMTP connection uses port 25 with no encryption (although I have also tried it on a different port with encryption).
I use Outlook on a different computer without this problem.
Any solution out there?