CANNOT SEND AN EMAIL WITHOUT ENTERING PGP private key
Sounds like you have a PGP / Secure certificate key enabled in your Account or in your Settings.
So first go to “Menu / Accounts” and select your account on the left. Then click your various tabs along the top and see if you have Security / PGP S/MIME enabled in there. If you do disable it and save accounts.
If there is no PGP S/MIME encryption enabled in your account setup, then go to “Menu / Settings (Preferences) / Signing and Encryption”. Then click Account Policies and Certificates and Keys and see if you have an accounts with certificates or keys enabled as per screenshot below.
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