You probably didn't need to remove your entire Spectrum account. But now, make sure you have Cookies allowed (see Settings | Privacy & Security | Web Content | Accept cookies from sites.) You should remove any existing cookies for Spectrum (click the "Show Cookies" button,) then restart Thunderbird. You should now be prompted for your credentials.

Nope. I fixed the Cookies, there were no existing cookies for Spectrum, clicked the "Show Cookies" button and restarted. It opened on the Settings page with no place for a password. ?? Very strange.

What error messages do you see (in full, verbatim, please)

Have you confirmed that you are using the right server settings?

https://www.spectrum.net/support/internet/mobile-email-setup

Thanks for your help. I got no error messages, just no email. Outgoing Server: Charter.net, Port=587, Connection Security=SSL/TLS, Authentication method: Normal password, User Name = my email. No place to put a password Server Settings: Server type: POP Mail Server (I don't know what this means. I don't think I put it in.) Port=993, User name=my email, Connection security=SSL/TLS, Authentication = Normal password. Again, no place to put a password.

Does this make any sense? Thanks, Jan