Can't sign if I sign

[Laura Orvokki Kursula]

On Sat, Apr 13, 2024 at 07:39:45AM +0200, Sirius via Mutt-users wrote:
> In days of yore (Sat, 13 Apr 2024), Laura Orvokki Kursula via Mutt-users thus quoth: 
> > Hello all
> > 
> > I have encountered a strange problem setting up mutt: when I attach a signature
> > block to my e-mail using `$signature', my PGP signature is, according to mutt,
> > invalid. E-mails without signature blocks yield valid PGP signatures. If I go
> > back and replace the automatic signature with something else, the PGP signature
> > checks out too. Is this a known issue? Is there something I can do about it?
> 
> That is odd. I do not see that at all (just tested, mutt-2.2.13 on
> Debian). For a gpg signature to be invalid, what is signed has to have
> changed in some way.
> 
> You are doing effectively this in muttrc:
>   set signature="~/.mutt/signature"
> yes? And there is nothing in the signature that could be altered after it
> is pulled into the message and the GnuPG signature is applied, right?

After some more testing, I figured out this issue had nothing at all to do with
signature blocks, or mutt. The culprit was the silly `X-Clacks-Overhead' header
I had configured postfix to add ages ago. How I came to think it had a
correlation with whether or not I use a `$signature' remains a mystery; my bet
is on a lack of sleep.

Thank you for your time.
 
> My questions would be:
>  - mutt gnupg configuration, is it changed in any way from distribution
>    default?
>  - version of mutt and what distribution/version are you running?
> 
> My suggestion would be to run mutt with -d1 or -d2 and look at the debug
> output (crank the debug level higher if need be, it goes up to five) to
> work out what happens.
> 
> -- 
> Kind regards,
> 
> /S



-- 
Laura
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