Enigmail fails to decrypt when message opened in Thunderbird

[mike]

Using the latest Enigmail version as of Thursday, January 11, 2024, when I encrypt + sign a message in Postbox and then send it, Thunderbird fails to open it with the error below.

Messages decrypt fine in Postbox itself. I've tried using the GPGSuite that was recommended and the new beta 2 version, but neither will work when trying to decrypt a received email in Thunderbird that was encrypted in Postbox using Enigmail.

(Note: If I encrypt + send an email in Thunderbird, that works fine in both Postbox and Thunderbird itself).

Please advise.

Thanks

                     Message Security - OpenPGP

** No Digital Signature**

 This message does not include the sender's digital signature. The
 absence of a digital signature means that the message could have
 been sent by someone pretending to have this email address. It is
 also possible that the message has been altered while in transit
 over the network.

      Message Cannot Be Decrypted

 There are unknown problems with this encrypted message.

[mike]

Follow up -- when I encrypt a test message Not Using Enigmail and send that encrypted text to Thunderbird for the appropriate email account, Thunderbird has no problems decrypting the message.

But, WITH Engimail, Thunderbird cannot decrypt and throws the message above.

Hope this extra info helps.

[Patrick Brunschwig]

If you want to decrypt a message sent to yourself you need the same private key in both email clients. Did you import they OpenPGP key you're using in Postbox to Thunderbird?

[mike]

Yes, I understand how the keys work. :) The local testing was just for testing. All keys were in their expected keyrings.

The main issue is with other (human) clients using Thunderbird.

Note that if I send an email to a ProtonMail user or another (email) client using Enigmail (in Postbox, in my case), the decrypt works OK. No problems.

If I use GPGTools to encrypt a message and just send that to Thunderbird w/o encrypting it (it's already encrypted), Thunderbird can decrypt that too. Again, no problem.

It seems to only be Enigmail + Thunderbird that aren't playing well together. Everything else seems to be OK. Based on my testing thus far, I would guess this is a Thunderbird bug of some kind.

Not sure there's much you can do. I've posted messages on the Mozilla form and listserve.

I'm not sure what else to test. I've already spent several hours on this so far.

Thanks,

[mike]

Yes. Sorry for any confusion. I understand how decrypting works locally. Both Postbox and Thunderbird are using their respective key rings and necessary keys are in both. The local testing was just ... testing.

The reported problem happens with other users where I have sent them an email using their public key.

From what I've been able to tell, this looks like a Thunderbird problem since ProtonMail and other users have no problems decrypting emails.

Thanks,

Sent from ProtonMail, Swiss-based encrypted email.

Sent with Proton Mail secure email.

On Friday, January 12th, 2024 at 12:09 PM, Patrick Brunschwig pbrunschwig@users.sourceforge.net wrote:

If you want to decrypt a message sent to yourself you need the same private key in both email clients. Did you import they OpenPGP key you're using in Postbox to Thunderbird?

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Enigmail fails to decrypt when message opened in Thunderbird

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