Cannot chose short message header in Mail 4.2 (Snow L.)

Hi!

I once chose not to display message headers in Mail 4.2 in the menu.

Now, I am unable to get them back. I get the long ones, but not the short.

How can I restore it ?

I am also using Letterbox. I tried to disable Letterbox, but the choice "Short Message header" is still nowhere to be seen.

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Macboook late 2007, Snow Leopard.

 

Sorry, I forgot to search before I asked.

I guess the answer is here.

http://forums.macrumors.com/showthread.php?t=730246

Can anyone delete this post ? I cant find any way to delete this thread.