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Sending of the message failed when trying to digitally sign a message with OpenPGP

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As the title says, when I enable the "Digitally sign" option for OpenPGP in a new mail, I get "Sending of the message failed" when trying to send, but if I disable only this option, then the message sends successfully.

That is the case whether I encrypt or not the message.

The versions of Thunderbird I tried where: 115.14.0 and 128.1.1esr.

As the title says, when I enable the "Digitally sign" option for OpenPGP in a new mail, I get "Sending of the message failed" when trying to send, but if I disable only this option, then the message sends successfully. That is the case whether I encrypt or not the message. The versions of Thunderbird I tried where: 115.14.0 and 128.1.1esr.

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