Is there a way to disable the data detector "feature" from Mail?
LE: OSX 10.8.3 / Mail 6.3 (1503)
No, Mountain Lion data detectors can not be disabled with a hidden preference (or the preference is so well hidden that nobody has published the details).
Once you know the name, you can search for articles on how to do this in case someone discovers a solution. Sadly, you used to be able to disable these at the terminal on 10.7, but I don't know of a way to disable them on Mountain Lion.
If you are on Lion or earlier, try this...
Turn off those annoying data detectors in Apple’s Mail by Jacqui Cheng is one such article with the following prescription to clear up the feature.
enter the following text exactly
defaults write com.apple.mail DisableDataDetectors YES