On 27 Sep 2017, at 22:00, Robert Goldman wrote:
Whenever I try to send a message with GPG encryption, I get an "OpenPGP encryption failed dialog box." The horrible error message (I know -- this is GPG's fault, not MailMate's!) looks like this:
The fact that I chose to just pass on the error messages to the user shows that I did not dare to try to “translate” them into something more comprehensible :)
But the trust level on my recipient's key is 5 and mine is 6. So why does this fail?
You need to sign the key, e.g., using the “GPG Keychain” application or `gpg2`. This is not always necessary though. OpenPGP is based on a “web of trust” and there are other ways that `gpg2` might determine that a key is valid. The details can be found in the “Using trust to validate keys” on [this page](https://www.gnupg.org/gph/en/manual/x334.html).
I don't claim to understand the details of “trust” and “validity” and I often find it confusing myself. Luckily (for me), all this really happens outside of MailMate. If you want to debug how MailMate uses `gpg2` then you can see how it's used by enabling the `MmDebugSecurity` hidden preference and launching MailMate from a Terminal window. You should be able to simply copy/paste the `gpg2` command and the arguments provided by MailMate if you want to do what MailMate does directly on the command line.
I hope this helps. -- Benny
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