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Encrypted email problem

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Hello, My name is Alejandro, sorry for my English, I'm from Spain and I'm using Google Translator. I have been using Thunderbird for a long time and today when I started the program, many illegible emails appeared, they cannot be read, I want to know how to solve this problem. It is important to me since the email is the work account. La versión actual que tengo es la 128.3.3esr (64-bits)

Thank you very much for your attention.

Hello, My name is Alejandro, sorry for my English, I'm from Spain and I'm using Google Translator. I have been using Thunderbird for a long time and today when I started the program, many illegible emails appeared, they cannot be read, I want to know how to solve this problem. It is important to me since the email is the work account. La versión actual que tengo es la 128.3.3esr (64-bits) Thank you very much for your attention.
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Hola, Eso parece un mensaje encriptado, esto sucede con todos los correos, solo los correos nuevos o algunos correos nuevos, estabas usando algún certificado para cifrar mensajes, que sucede en modo seguro? https://support.mozilla.org/es/kb/modo-seguro-tb#w_como-iniciar-thunderbird-en-modo- Saludos

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