Another way to organize messages in a folder besides threading (see Threading) or using full-text indexed searches (see Searching) is by limiting the folder display to messages that are similar to the current message.
mh-prefix-help).
mh-narrow-to-tick).
mh-narrow-to-cc).
mh-narrow-to-from).
mh-narrow-to-range).
mh-narrow-to-subject).
mh-narrow-to-to).
mh-widen).
All of the limiting commands above refine the display in some way.
The commands / c (mh-narrow-to-cc), / m
(mh-narrow-to-from), / s (mh-narrow-to-subject),
and / t (mh-narrow-to-to) restrict the display to
messages matching the content of the respective field in the current
message. However, you can give any of these a prefix argument to edit
the pick expression used to narrow the view1.
You can also limit the display to messages in the `tick' sequence
with the command / ' (mh-narrow-to-tick).
See Sequences, for information on putting message into the
`tick' sequence. Use the / g (mh-narrow-to-range)
command to limit the display to messages in a range (see Ranges).
Each limit can be undone in turn with the / w (mh-widen)
command. Give this command a prefix argument to remove all limits.