In Leopard, the Mac Mail application has data detectors that detect certain types of data like dates, times, and addresses and turns them into clickable pieces of information so that you can add them into iCal, the Address Book, or other applications. If you use these, great. If not, the data detectors are just a little annoying.

If you are not using them, you can turn them off. Just open a terminal window and enter the following command:

defaults write com.apple.mail DisableDataDetectors YES

Once this command is entered, quit Mail and restart it. The data detectors will now be gone. I fyou change your mind and want them back, repeat the command but replace the YES with NO.