Cannot decrypt messages if signature cannot be verified due to missing public key
I'm using GPGTools 2026.1 (3604n) on Sequoia and find GPGMail fails to decrypt signed+encrypted messages if it cannot verify the signature due to the public key of the signer not being present in the keyring. In previous versions, I believe it would decrypt the message but display a warning about not being able to verify the signature. Now, the below error message pops up and the message remains encrypted in Mail.app
Decryption failed with unknown error!
An unknown error occurred while decrypting this message.
GPG error message:
gpg: encrypted with rsa4096 key, ID
***********************, created YYY-MM-DD
"First Last <emailfdomain.com>"
gpg using
""****************************************"" as default secret key for signing
gpg: Signature made Tue Feb 10 22:27:29 2026 EST gpg:
using RSA key
"****************************************"
gpg: Can't check signature: No public key
Please contact us, including the GPG error message, at https://support.gpgtools.org
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