"Signature verification failed"

[Joel C. Salomon]

I’m using Thunderbird 2.0.0.21 + Enigmail 0.95.7 (20080808) with GnuPG
1.4.9 under Windows.  On some messages (e.g., this recent one from
Thomas Bohn: <AE944322-4D68-40BA-B501-6589512B88E2 at bohnomat.de>) I get
the message, “Error - signature verification failed; click Pen icon for
details”.  The error message from GnuPG is:

OpenPGP Security Info

Error - signature verification failed

gpg command line and output:
C:\\Program Files\\GNU\\GnuPG\\gpg.exe --charset utf8  --batch --no-tty
--status-fd 2 --keyserver-options auto-key-retrieve --keyserver
pool.sks-keyservers.net --verify
gpg: Signature made 06/19/09 23:53:14 using DSA key ID 69274BBB
gpg: BAD signature from "Thomas BOHN <thomas at bohnomat.de>"

Where does this problem come from?

—Joel Salomon

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