Fail to encrypt with untrusted public keys

[denmaddin]

Every try to send/encrypt an mail results in the following message (loosely translated into english):

GnuPG Error
gpg: F79E2C97: There is no guarantee that this key really belongs to the listed owner.
gpg: [stdin]: encryption failed: unusable public key.

Decryption howerver, works fine.
Using Enigmail (same gpg.exe) to encrypt the same mail, fine too.
The problem is reproduceable on at least 3 different machines with an equal enviroment.
Eventually the add-in not fully compatible with an x64 OS?

The enviroment:
Outlook 2007 (12.0.6535.5005) SP2 MSO (12.0.6535.5002)
Windows Vista (x64) 6.0.6002 Service Pack 2 Build 6002
GnuPG 1.4.10 (2009-09-02)
Enigmail 1.0.1 (20100122-0953)

[doegox]

This is because those keys are not properly linked in your trust chain.
If e.g. you sign locally those keys, it'll work.
The trick Enigmail is using is that by default it bypasses any trust chain check:
pref("extensions.enigmail.alwaysTrustSend",true);
which has as effect to append "--always-trust"(for gpg < 1.4) or "--trust-model always" (for gpg >=1.4) to the gpg options

Now there is still a bug in OutlookGnuPG plugin because normally it should have prompted you with a confirmation box à la "do it anyway or cancel".
Tech note for the developer to solve this issue: we catch in the code the GPG error with:
ex.Message.StartsWith("gpg: C4771111")
while here the error starts with "gpg: F79E2C97" so we should be more robust to detect this case.

Meanwhile the workaround for you is either to sign locally the keys or to set "trust-model always" in your gpg config file

[doegox]

Mmm someone else got the message
gpg: 504EA351: There is no assurance this key belongs to the named user.
So we've really to find a way to detect consistently this type of error no matter the exact code & phrasing...
One idea: in case of error, make an internal attempt with "--trust-model always" to see if it works and if yes, then only prompts the user to confirm & send it anyway.

[janusqa]

Where can I find the gpg config file?
Thanks.

[doegox]

To find out where your GnuPG HomeDir is, run gpg --version and check the Home: line.

[janusqa]

Ok this work-around seems to have worked exactly as you said. Thanks.