GPGMail: Constant error about public key

Quinton's Avatar


20 Mar, 2018 02:12 PM

While composing an email I repeatedly get a pop-up error that says “unable to encrypt; unusable public key”. I’ve never seen this error before. I’ve disabled encryption of draft messages to avoid this problem.

No error messages!

Additional info
This seems to be specific to a mailbox I’m selecting.

Mac OS X        10.11.6             (15G19009)
Libmacgpg       0.7         769 
GPGMail         2.6         1150
GPG Keychain    1.3         1220
GPGServices     1.11        907 
MacGPG2         2.0.30      875 
GPGPreferences  2.0         887 
Pinentry        0.9.7       2
  1. Support Staff 1 Posted by Steve on 21 Mar, 2018 08:20 AM

    Steve's Avatar

    Hi Quinton,

    welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.

    Let's check if your key is ok:

    1. open GPG Keychain
    2. double click your sec/pub key
    3. search for "Validity" in key tab and post the value to your discussion
    4. search for "Validity" in subkey tab and post the value to your discussion

    Should your key have expired, please re-new the expiration date in the key tab. To renew the subkey, click the cogwheel icon in the subkey tab and update the expiration date.

    To test the change, send a signed and encrypted test email to yourself. Are you able to decrypt and verify the signature successfully?

    In case your key resides on the public key servers, don't forget to upload your updated key, so that the changes are reflected there as well.

    You seem to be using a rather old version of GPG Suite. You may want to consider enabling automatic update checks in order to be notified about new releases. I suggest downloading the latest GPG Suite from our homepage and installing that over your current installation.

    Best regards,

  2. Support Staff 2 Posted by Steve on 20 Apr, 2018 11:53 AM

    Steve's Avatar

    Closing, since no further user feedback was received. Should your problem persist, feel free to re-open this discussion any time.

    All the best, steve

  3. Steve closed this discussion on 20 Apr, 2018 11:53 AM.

  4. Steve closed this discussion on 27 Aug, 2018 12:40 PM.

Comments are currently closed for this discussion. You can start a new one.

Keyboard shortcuts


? Show this help
ESC Blurs the current field

Comment Form

r Focus the comment reply box
^ + ↩ Submit the comment

You can use Command ⌘ instead of Control ^ on Mac