Outlook 2016 SMTP Settings Incorrect
I have been having this issue for over a year now.
The Cox SMTP Server Settings are not working in Outlook 2016. I can receive e-mails via imap.cox.net but, I cannot sent e-mails via smtp.cox.net....
Forum Discussion
This is another approach: setup your account via Control Panel as opposed to Outlook.
I forgot I had this problem a few years ago with Windows XP Pro. Professional versions of Microsoft are domain-oriented so the OS becomes more involved with Security Management...as opposed to just the application. When Cox required us to change SMTP ports, I couldn't get Outlook to send email.
answers.microsoft.com/.../59e9c3c3-b3a7-49fe-a2b0-758258966c3e
