Why does my IP get blacklisted with Outlook 365 mail app?


If you are using the Outlook 365 app or Windows Mail app with your business email, you may notice that your internet IP address gets blacklisted again and again. This usually happens because Outlook 365 only supports IMAP connections and not POP3. When your email password is changed, the app may continue trying to log in with the old saved password in the background. These repeated failed login attempts are detected by the mail server, which then blocks your IP to protect against unauthorized access.

To fix this problem, first confirm whether you are using Classic Outlook or the Outlook 365 app. If you are on Outlook 365, it is recommended to change the default email account from your business domain email to a Hotmail or Gmail account, and make sure the correct password is updated everywhere in the app. If the issue still persists, try deleting and re-adding the email account, removing the Windows Mail app entirely, or in rare cases, reinstalling Windows. For long-term stability and fewer errors, we recommend using Classic Outlook (desktop) or another email client like Thunderbird that supports both IMAP and POP3 with better password handling.