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SMTP and IMAP settings

I've tried everything I can think of, read, or ask about, including the help fora. My Thunderbird settings no long handshake with Charter.com. I think IMAP might be okay, but SMPT is not. Every time I try a new fix, I get a different error message, although now they are whittled down to about 4. I'm ready to abandon Thunderbird, though I like its features more than any other provider's. Thanks for clear direction ... if there is any.
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Are you able to access your E-mail via Webmail ? You can click test at: http://bit.ly/2RocRea. You can also confirm the settings email server settings at: http://bit.ly/2UqCrRz. If you are still having trouble please let us know.
@Jenweil I've been using Thunderbird with Spectrum (previously Time Warner) for years now and it works perfectly. For reference, see my Thunderbird (version78.6.0) configuration below. Hope this helps
IMAP Mail Server
ServerName: mail.twc.com
Port: 993
Security Settings
Connection security: SSL/TLS
Authentication method: Normal password
Outgoing Server (SMTP) Settings
Server Name: mail.twc.com
Port: 587
Authentication method: Normal password
Connection Sercurity: STARTTLS