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bgcostello's avatar
bgcostello
New Contributor
2 years ago

Undeliverable mail error using Outlook on MAC

Using Outlook email on my MAC the Incoming email is received just fine.  Cannot send outgoing email from my cox.net account.  I receive the following error message in the undeliverable mail notice.  I have checked all the email server settings and the are as they need to be per Cox email server information I can find.

What is the fix for this?

Recommendations?

Technical details
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: 74e4

3 Replies

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  • WiderMouthOpen's avatar
    WiderMouthOpen
    Esteemed Contributor

    I have seen other people having problems with the "new" Outlook for Mac and not just on Cox. See here. My suggestion would be to revert to the "old" Outlook until they have worked out the kinks.

    • bgcostello's avatar
      bgcostello
      New Contributor

      Thank you for the reply. I reverted to the Legacy Outlook and that appears to have corrected the issue.

      • WiderMouthOpen's avatar
        WiderMouthOpen
        Esteemed Contributor

        Yea, sorry I didn't have a better answer. I think it has something to do with how the new Outlook integrates the Microsoft Cloud. It doesn't seem to effect Gmail so you can't totally point the blame at Microsoft.