First, delete everything in your outbox. Wait 6 hrs BEFORE you try to send anything! Ensure you are using port 465 for outgoing and for IMAP 993 for incoming, or POP 995. Check your antivirus., If you have email scanning turned on, try turning it off.
BTW, Email username does NOT include @cox.net. I removed email username/pwd from the below for safety.
On that note, TLS 1.2 is now required to utilize Windows Update. If this is a fresh installation of Windows 7 you're working with, you'll need to address the TLS 1.2 issue for anything to work correctly.