How to save email sorted by date?

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http://unix.stackexchange.com – I seem to remember a patch to mutt that allowed to modify the path of the mailbox in mbox-hook in include the date. For example, you could have this: mbox-hook Maildir +Archive/%y/%m/maildir Which would save the emails in Archive/2011/12/maildir if they were send during December 2011. Anyone knows what it was called or if it still is supported? If not, does anyone know how I could achieve the same thing? (HowTos)