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This error often happens when you don't use SSL to secure your email account. To fix this error, use the following steps.
Please try below steps and let me know if this fixed your problem. :-
Choose Settings > Manage Accounts.
Choose the account that's out-of-date to display the account settings dialog.
Choose Change mailbox sync settings > Advanced mailbox settings. You may have to scroll down in the dialog to see Advanced mailbox settings.
Check the boxes for Require SSL for incoming email and Require SSL for outgoing email and then choose Done > Save.