Thunderbird does not connect with spectrum email to download messages. Messages can not be sent out. Why
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This is a volunteer peer support forum, so given you have told us nothing except your perception that t does not work, we are not even going to be able to guess what the issue is.
So lets start again. When you send mail, I assume you get an error message, perhaps you could share that verbatim as that would be the primary clue as to why!