can't seem to get folder-hook to work

[Anand Buddhdev]

I'm using mutt 1.2.5i

I have the following in my .muttrc:

save-hook . =read
send-hook . my_hdr From: [EMAIL PROTECTED]
folder-hook . 'set sort=date-received record==sent ; my_hdr From: [EMAIL PROTECTED]'
folder-hook hostmaster 'unmy_hdr from ; my_hdr From: [EMAIL PROTECTED] ; set 
record==hostmaster.sent'

When I read my hostmaster mailbox, the Fcc: is correctly set to
"=hostmaster.sent", but the From: header remains as "From: [EMAIL PROTECTED]",
instead of "[EMAIL PROTECTED]". And I can't understand why this
is happening. Am I doing something wrong?

-- 
Anand Buddhdev