GPG Mail can't decrypt message
Sometimes things go wrong and a message is not decrypted. When GPG Mail is unable to decrypt an email it displays a warning at the top of the email along with a
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Various circumstances can cause GPG Mail to be unable to decrypt an incoming email. The most likely being, that the message author used the wrong public key to encrypt the message in question, which then results in the error message `Secret key to decrypt the message is missing. Since the corresponding secret key does not exist on your system, you are unable to decrypt that message.
When multiple public keys for your email address exist, your contact may be using an old key of yours, which you have already replaced.
Or your secret key got lost on your local machine. This can happen after moving to a new computer but forgetting to transfer your secret keys. In that case you would need to recover your secret keys from a backup.
We recommend to upload and verify your current key on the key server.
To ensure your contact is using the correct public key of yours, we suggest to verify and sign each others public keys.