folder-hook . "set sort=date-received"

folder-hook . "set index_format='%{%F %T} %Z %-25.25s  %-24.24a %4.4c'"

# I don't really need to see the "From" in my sent
# folder. "To" is probably a bit more useful.
folder-hook sent "set index_format='%{%F %T} %Z %-25.25s  %-24.24t %4.4c'"

# Sort any mailing list messages by thread.
# This assumes, of course, that all of your
# mailing list messages are stored under /lists/.
folder-hook ^lists/ "set sort=threads"