Data Detectors allow you to turn addresses, phone numbers and dates in mail messages into Address Book contacts and iCal events. You can also turn selected text into to-do items or stickies.
Check out MacMost Now 159: Using Data Detectors at YouTube for closed captioning and more options.
To turn off Data Detectors, open the Terminal program from your Applications, Utilities folder, and type:
defaults write com.apple.mail DisableDataDetectors YES
To turn it back on again, type:
defaults write com.apple.mail DisableDataDetectors NO
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