This are the ~/.mutt/muttrc files I use on Mac and Linux. Use at your own risk.
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Install mutt with sidebar patch.
On Ubuntu Linux 12.04:
$ sudo apt-get install mutt-patched
On Mac OS X with Homebrew:
$ brew install mutt --with-sidebar-patch
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Clone this repository.
$ git clone https://github.com/mhubig/mutt.git ~/.mutt
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Rename credentials.example to credentials.muttrc, and fill in your personal stuff. Don't forget to secure it!
$ chmod 600 ~/.mutt/credentials.muttrc