technology/communication/mutt.md
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* limit new (unread) messages using `~U`
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+## index format
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+default index format is (taken from [muttrc man][])
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+```
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+"%4C %Z %{%b %d} %-15.15L (%?l?%4l&%4c?) %s"
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+```
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+
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+current format is
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+```
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+"%Z %-30.30L %M %s"
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+```
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+_message status, sender, hidden msgs (in thread), subject_
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+
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+## threads
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+collapse threads using `Esc-v`
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+
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+[rebind collapse-thread][] to '-'
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+```
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+bind index - collapse-thread
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+```
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+
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+configure threads to be collapsed when mailbox opened ([thread_ref][])
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+```
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+folder-hook . "push <collapse-all>\n"
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+```
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+
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+[muttrc man]: https://linux.die.net/man/5/muttrc
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+[rebind collapse-thread]: https://heipei.net/2009/09/10/mutt-threading-like-a-pro/
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+[thread_ref]: http://compgroups.net/comp.mail.mutt/collapsing-threads-by-default/2550437