GPGMail: error message: gpg: [stdin]: encryption failed: Unusable public key

Antonio Lobo's Avatar

Antonio Lobo

03 Apr, 2018 01:58 PM

gpg: 814951FD2730D872D05EFDCDA8D23F25C23E3524: skipped: Unusable public key
gpg: [stdin]: encryption failed: Unusable public key

The mail will not show up this error, because my key is valid?

macOS                   10.11.6     15G2001
GPG Suite               2018.1      2083    (9658b70)
GPGMail                 2.6.4       1249    (d765eca)
GPG Keychain            1.4.2       1403    (128637e)
GPGServices             1.11.2      969     (e5438f7)
MacGPG                  2.2.3       900     (cead4f9)
GPG Suite Preferences   2.1.1       993     (05eb1a6)
Libmacgpg               0.8.2       829     (943132e)
pinentry           9       (db18340)
  1. 1 Posted by Antonio Lobo on 03 Apr, 2018 04:23 PM

    Antonio Lobo's Avatar

    I'm having the same problem. Any ideas what is going on?
    I'm using Mail app version 9.3 (3124) with Mac OSX 10.11.6 (El Capitan).


  2. Support Staff 2 Posted by Steve on 05 Apr, 2018 03:58 PM

    Steve's Avatar

    Hi Antonio,

    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.

    Best regards,

  3. 3 Posted by ABLobo on 05 Apr, 2018 09:31 PM

    ABLobo's Avatar

    Dear Steve,

    Thank you some much for all your tips.
    It works now! :)
    My very best regards,


  4. Support Staff 4 Posted by Steve on 05 Apr, 2018 10:57 PM

    Steve's Avatar

    You are welcome. We have tickets pending to improve this situation and warn users when their key or subkey is about to expire.

    Glad, this is solved for you. I'm closing this discussion. Should you need further assistance or have questions you can re-open this discussion here or open a new one any time.


  5. Steve closed this discussion on 05 Apr, 2018 10:57 PM.

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