Read the forum guidelines
Incoming email is fine.
Cannot send outgoing email.
I saw a thread from four months ago, but it was locked without any clue as to resolution. Tech Support was unable to help as well.
Recommendations?
It's on a new Mac by the way.
Could you copy/paste the error exactly? Something like:
"SmtpSubmissionPermanent5XXException: Smtp submission failed. Server 'smtp.cox.net' Port '465'. --> Unexpected SMTP server response. Expected: 250, actual: 503, whole response: 503 not availableFailure code: 5513"?
Have you tried with Mac Mail?
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
No. Would prefer a single provider.