For the last week, I am unable to send email on my pc using Thunderbird, on my phone using Blue Mail. I can receive email. When I send using my pc, I get "Login to server smtp.cox.net with username xxxxx failed" The xxxxx is my userid. The password saved is the exact same thing as the SMTP password. I can send/receive email using the myemail.cox.net website. There have been NO changes to my email settings.
This same problem happen last year and eventually, magically, the problem disappeared all by itself. Last time this happened, I talked to Cox support and nobody could figure it out. Frustrating.