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Cannot write an email

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Hello - all incoming functions on Thunderbird are working but I cannot compose an email. There is a lock thru the subject line and reply and forward functions dont work for received emails. Also no cc or bcc lines on the send eamil template. Photo of wreite an email screen attached. Please help thanks

Hello - all incoming functions on Thunderbird are working but I cannot compose an email. There is a lock thru the subject line and reply and forward functions dont work for received emails. Also no cc or bcc lines on the send eamil template. Photo of wreite an email screen attached. Please help thanks

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This appears to be cause by an encryption function running in Thunderbird, but I have no experience in encrypting to advise of a resolution.

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Thanks and I will continue to watch to see if someone else can help

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