Using Microsoft Outlook for Mac version 16.54 Microsoft 365 and receiving bounce back when "New Outlook" toggled on but no bounce when toggled off.
Using Microsoft Outlook for Mac version 16.54 Microsoft 365 and receiving bounce back when "New Outlook" toggled on but no bounce when toggled off. A Gmail account does not have the same issue. The bounce error is: SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'smtp.cox.net' Port '465'. --> Unexpected SMTP server response. Expected: 250, actual: 503, whole response: 503 not available Failure code: 5513 Updated the password per Cox' support site, but didn't resolve. When sending with the "New Outlook" toggled on, the above bounce happens but toggling off "New Outlook", email sends fine. No problem receiving emails either way. Checked for Office update and it says Office is up to date. Any suggestions?For MAC users with Outlook 365 that want to transition from COX to Yahoo email
Below are a set of repeatable instructions for the transition from COX.net to yahoo.com email MS OUTLOOK 365 migration on MacBook; open Outlook Outlook > settings > personal settings/accounts Click “+” to add account lower left corner Enter Email address username@cox.net Click Continue Select “not IMAP?” in upper right corner and select “Y! Yahoo” Select “Sync to the Microsoft Cloud” by pressing “Continue” Log into Yahoo with email account & regular password ( and prove you are not a robot) Click “Agree”, if you agree Add a verification option if requested by Yahoo Access for MS Outlook > agree Select profile in MS Outlook if asked It isn’t working until you get a grayed out “Microsoft Sync technology” under the email address in the “accounts” settings (not sure why) This has now worked repeatably for me with 9 Cox email accounts