GPGMail: 1822direkt bank using old software resulting in emails with no MDC

Peter's Avatar


16 Jul, 2018 10:34 AM

I'm contacting you because of the KB article on MDC errors. Since 2018.3 I've trouble with mails from [email blocked] (C4CAEE2C) that give instant transaction information for my banking accounts. Obviously, the certificate is hopelessly outdated and lacks MDC. However, after contacting the company there seems to be no quick solution to that problem. Moreover, I'd love to also have quick and easy access to my history within Apple Mail.

Therefore, I kindly request said workaround for GPGMail.



Automatic decryption of said (old) mails.

macOS                   10.13.5     17F77
GPG Suite               2018.3      2223    (8d0c266)
GPGMail                 3.0b7       1319    (c2d0df0a)
GPG Keychain            1.4.4       1460    (9010342)
GPGServices             1.11.4      1013    (0b04f6c)
MacGPG                  2.2.8       916     (0ed4a99)
GPG Suite Preferences   2.1.2       997     (1a09bc7)
Libmacgpg               0.8.5       863     (0707962)
pinentry           9       (db18340)
  1. Support Staff 1 Posted by Steve on 17 Jul, 2018 09:40 AM

    Steve's Avatar

    Hi Peter,

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

    We already had another user reporting this exact problem with that specific bank. We really think the ball is in the banks hands and they should update the software they are using rather sooner than later. It's interesting to hear they tell one user they are working on an update to solve the problem and now they tell another customer, that there is no near-term solution. They are currently using a deprecated software from 2005.

    So in you should be seeing something like:

    -----BEGIN PGP MESSAGE-----
    Version: Cryptix OpenPGP 0.20050418

    You can use GPGServices to decrypt that message, which would be preferrable to always allowing decryption of messages with no MDC which we do not recommend.

    Does the GPGServices workaround work for you?

    The following two Knowledge Base articles explain how GPGServices is used:

    • KB explaining decryption and verification


    PS: To benefit from the latest security fixes from apple, you may want to check for pending macOS updates in the MacAppStore. General info about Apple security releases including the latest macOS release.

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