According to the raw source of your message, you are running:
"User-Agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101
Thunderbird/24.2.0"
User-Agent strings lie. :)
Take a look at the original message. In the OpenPGP signature there
was a comment block identifying it as having been generated with
GPGtools, which is an OS X port of GnuPG.
You might update to Enigmail 1.6 by downloading the appropriate release
from <https://www.enigmail.net/download/index.php> and proceed according
to the instructions.
Please don't, actually. Enigmail's rule of thumb is that you should
only upgrade from the Enigmail master site if you're running a
plain-Jane stock Thunderbird. We don't know what specific
customizations GPGtools has made to Thunderbird and we can't guarantee
that our Enigmail 1.6 will work with GPGtools' version of Thunderbird.
Instead, please ask GPGtools -- *politely*, because it's important to
be nice! -- to release a new version of GPGtools which incorporates
the latest Thunderbird and Enigmail. :)
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