[Enigmail] Signature checks fails so often

[Noiano]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

John W. Moore III wrote:
> Bob Henson wrote:
>> Noiano wrote:-
> 
>>> Noiano wrote:
>>>> Hi everybody
>>>> I am using Enigmail 0.95.5 and very often the signature attached to
>>>> messages are not valid. This is quite a bit annoying because I have
>>>> to re send the message to the recipient.
>>>> How can I solve this?
> 
> Another possibility is that You have require-cross-certification enabled
> and the Sigs that don't verify are ones where the Key Owner hasn't cross
> certified their sub-Keys. :-\
> 

I don't even know what that is :-) so I think this is not the
problem. If it was all messages should have invalid signature
instead of "many". The latest message I sent with an invalid
signature can be found here:
http://www.sikurezza.org/ml/msg15881.html. I have tried to resend it
again and again but the signature is *always* invalid. What's wrong
with that message? It is pure plain text.

Please help.

Noiano
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iE8DBQFHLsoM+JjGoasQ6NIRCCO9AN924rPeB8V1K+Ddaf5wkiOljMmEif9sts3l
E/dJAOCIKOzaNx0GGHjPwEQJVxCYYXG6Q8zM04/gvwYF
=5ZyC
-----END PGP SIGNATURE-----