[MlMt] Bad GPG signature when sending emails

[Manuel Kreutz]

On 14 Feb 2014, at 6:20, Benny Kjær Nielsen wrote:

> On 14 Feb 2014, at 1:09, Manuel Kreutz wrote:
>
>> Looking at the string GPG2 used to sign and validate, it appears the 
>> two character difference is a new line character "\n" around the 
>> "-----BEGIN PGP SIGNATURE .." part of the message. Removing those two 
>> characters and attempting to validate the email content + PGP 
>> signature via the command line works fine afterwards.
>
> Thanks for the detailed report. In theory, I should be able to 
> reproduce by simply sending a signed message to myself, but I don't 
> have this problem. Based on your description, it sounds like a newline 
> might be inserted during transport, but that doesn't sound very 
> likely. In any case, try comparing the message in Sent Messages with 
> thee message you receive. Is there any difference?
>
> If they are equivalent: Try using “Message ▸ Reset” on the sent 
> message. That should then, in theory, trigger MailMate to also fail on 
> the sent message.
>
> If they are not equivalent: Not sure. Maybe we should look into if the 
> SMTP server plays a role.

First of all - thanks a lot for responding so quickly Benny!

Comparing the Raw Message in Sent Messages vs. what I received shows the 
same difference of a new line added right before the "--=_MailMate_" 
meta tag starts. For lack of sleep reasons I unfortunately did not 
consider the SMTP server being the issue, which it turns out to be..

I am using MailJet(.com) as SMTP across all my mail accounts, which is 
apparently messing with the body of messages and effectively breaking 
GPG signing:

- https://gpgtools.lighthouseapp.com/projects/65764/tickets/700
- 
http://support.gpgtools.org/discussions/everything/12600-messages-show-with-invalid-signature

Thanks again for the response and my apologies for not ruling out the 
delivery side of it. Time to change my SMTP setup :)

Have a great week

-manuel