[Enigmail] wrong signature

[Ramon Loureiro]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
 
Hi!
I 've just posted a signed msg to a public mailing list with Enigmail
http://lists.gnupg.org/pipermail/gnupg-users/2008-April/033309.html
If I copy and verify the signature FireGPG says that it is not a valid 
signature!

Any idea?

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (MingW32)
 
iQEcBAEBAgAGBQJIGNbaAAoJEMVZKsuAx9ZHiQQH/0GBP74DtCXlH5bhtgo5kKGC
AR5+js5S63dywcNwLCVmjp4YLD0gYbfHbuxirpp7uzCxYhFvQrQLnXu0w+Ww1uac
tmKxJsP6QcJRHP0cVP1Ykx+/3mAJ2efhfFpRkSrDuwzJnP3LjKiIALuemLTyHGaO
YNn3lz+zhNTOr0q9E7ACtODZKPh6PmPqFKVz8XncnXG9kbHYkNsaO0Aya6k8Dwdf
YbKzU4k3TFrUNhj1mff0ihN7G/nvZnXJW6sjlTMDagmjXZ5U7J196YXVwnIKIkXe
WogL7mROSfRQS/99/9WNNHlLUx6MCd/PEYS7R9/6B0p3wZx1JfQeaG6DW4+klTM=
=ocrS
-----END PGP SIGNATURE-----