Can't sign if I sign

[Sirius]

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?

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
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