On Thu, Jul 26 2012, Greg Troxel wrote:

>   message-get-reply-headers: Autoloading failed to define function mail-dont-reply-to
>
> when typing 'r' to a message in nnimap summary.

Hm, which Emacs version are you running?

-- 
Julien Danjou
-- Free Software hacker & freelance
-- http://julien.danjou.info