On 13.07.2015, Patrick Shanahan wrote: 

> * Eric Smith <e...@fruitcom.com> [07-13-15 09:17]:
> > Has anyone implemented this or is considering to do so?
 
> Been using it for *quite* a few years now.

AFAIK, mutt's header cache only works for IMAP and Maildir, but not
for the mbox format.

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