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How to disable reply animations in for Mountain Lion

16 August 2012 - Colorado

I have been using this trick for awhile, and there is a lot of false information out there, so I figured I should post this for posterity. To disable that super annoying reply animation in Mail (where it slowly fades into the center of the screen) – open Terminal or iTerm2 or whatever and type:

defaults write DisableReplyAnimations -bool TRUE

But wait! you say – I have seen numerous posts that say something similar. True dat – but they are all wrong (at least the many I saw). defaults for Mail (in Mountain Lion at least) is case sensitive – I was going crazy trying to get it to work, but they all said, which is incorrect – you need

Hopefully this saves you all some headaches.