GPG Mail: Invalid signatures in Apple Mail

tapoensgen's Avatar


11 Jun, 2021 09:35 AM

I have GPG Suite installed and generally working well. We use Apple Mail running on the Suite platform.
When I send emails to internal GSuite groups (only) the recipient(s) get(s) an invalid signature error popping up in the Apple Mail message. Is there a fix for that?

  1. Support Staff 1 Posted by Steve on 11 Jun, 2021 06:14 PM

    Steve's Avatar

    Hi tapoensgen,

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

    We've seen this problem with various mailing group solutions like MS exchange, Google groups as well as Yahoo groups. Those services have the tendency to destroy valid email signature by slightly altering the structure of the message. We encourage users to bring up this problem with the corresponding developer so that they can improve their service to not render valid signatures invalid: Yahoo Groups help community, Google Groups Feedback, Mirosoft Support.

    Please export the sent message as well as the received message, so that we can take a closer look. To export, select a message and press CMD + SHIFT + S, select "Raw Message Source" as type and save it. Then add both files to this discussion by visiting it in your browser (an email reply should work but sometimes attachments do not arrive).

    We will then compare the messages and be able to understand in what way the message has been manipulated and potentially find a workaround.

    All the best,

  2. Steve closed this discussion on 04 Jul, 2021 10:24 AM.

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