Solved
Cannot Send with Thunderbird
I have been using Cox email for over 40 years and most of that time I have used Thunderbird as my email program.
Cox just switched to enhanced security server settings and I have changed both incom...
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I found another email client that I installed then imported all settings from 2 TB accounts as POP3. All messages and contacts came over correctly and receiving email works just fine.
As for outgoing, one of the accounts I installed worked perfectly but the other will not send and gives a strange error message.
Also, I noted that the smtp port has been changed from 465 to 587.
The program is called eM Client downloaded from emailclient.com/download.
