Force Plain Text in Mail.app
This is the stupidest thing to get all excited about, but I just found out that you can set Apple’s Mail client to display the plain text instead of html. Sure, there’s that option to hide HTML images in the Preferences, but that doesn’t do anything to fix e-mail from folks who insist on using the whole box of crayons in every e-mail, or set their replies in godawful Papyrus or Comic Sans. I’d rather just see plain text. (There are other, work-related reasons for this, too, but it’s not worth explaining.)
Anyway, there’s a hidden preference for this. Just enter the following command into a Terminal window:
defaults write com.apple.mail PreferPlainText -bool TRUE
Boom. Suddenly, my e-mail just got a bit more manageable.