folder-hook set ?

[Jeff Howie]

Hi all. In mutt 1.2.5i, I'm trying to set the following in my .muttrc:

    set record=+SENT-MAIL
    folder-hook . set sort=threads \
        index_format="%3C/%m %Z %{%Y-%m-%d %H:%M} %-15.15F %s"
    folder-hook SENT-MAIL set sort=to \
        index_format="%3C/%m %Z %{%Y-%m-%d %H:%M} %-15.15t %s"

Which gives me a startup error '%Z: unknown variable' & all that shows
in the index is the msg # & total msg fields. But when I remove the
above folder-hook's & just have:

    set index_format="%3C/%m %Z %{%Y-%m-%d %H:%M} %-15.15F %s"

The index_format works just fine. What am I doing wrong?

thks.jeff