refresh_mutt_header_cache.sh

#!/bin/bash
# script to update your header cache for imap folders of interest non-interactively.
# set this up to run nightly in cron - it especially helps the performance of BIG mail boxes
# e.g. mailboxes big enough to crash outlook are super-snappy after header cache refresh
declare -a FOLDERS=("Archive"                    
                    "Drafts"
                    "INBOX"
                    "Outbox"
                    "Sent\ Items"
                    "Tasks"
                    "Trash"
# etc ...
)

for i in "${FOLDERS[@]}"
    do 
        tmux -c "mutt -f =$i -e 'push <quit>'"
done