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

# 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"

# The "33" is a magic number, totaling the number of characters in the
# non-subject/author fields.
#
# We need a special rule for the "Sent" folder so it shows the "To"
# address instead of the "From" address.
#
folder-hook .*[sS]ent.* 'set my_col_from = `echo $((30 * ($(tput cols)-33) / 100))`; set my_col_subject = `echo $((70 * ($(tput cols)-33) / 100))`; set index_format="%D | %Z %-$my_col_from.${my_col_from}t %-$my_col_subject.${my_col_subject}s (%-4.4c)"'

folder-hook ! .*[sS]ent.* 'set my_col_from = `echo $((30 * ($(tput cols)-33) / 100))`; set my_col_subject = `echo $((70 * ($(tput cols)-33) / 100))`; set index_format="%D | %Z %-$my_col_from.${my_col_from}F %-$my_col_subject.${my_col_subject}s (%-4.4c)"'