How to open a PGP encrypted mails on Thunderbird?

Thunderbird cannot decrypt emails forwarded PGP encrypted, because recipient does not match with the one in the key.
I found this article which didn’t work. Is there other way?

I’m not sure I am understanding your question…

It sounds like you have already added you public PGP key to your SimpleLogin mailbox, as described here:

If so, to decrypt forwarded emails from SimpleLogin in Thunderbird you have to set-up Thunderbird with your private key. See here:

Does this help?