Community had no answer to my probem
Thunderbird will no longer save sent emails to my SENT folder. I get an error message when I send an e-mail saying, "Your message was sent but a copy was not placed in our sent folder(Sent) due to network or file access errors. You can retry or save the message locally to Local Folders/Sent-using my email address. Cox Communications is my ISP and they say the problem is not theirs.
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Your account https://support.mozilla.org/en-US/user/dpaged/ suggests you have not posted other support requests.