I am not sure if I understand the "formatting" properly. If I read it correctly the special formatting needed if action/trigger is desired otherwise standard email would do?
If I make an appt in my calendar and tell it to alert me via email where iCal is polling, shouldn't that just work? Or does the iCal trigger when it sees an invite that was sent to the mailbox it's checking? Neither case works for me, the iCal scans the mailbox but doesn't seem to pick any emails:
iCal Alarm Processor Debug Checking for alerts
iCal Alarm Processor Debug Logging in
iCal Alarm Processor Debug message ids:
iCal Alarm Processor Debug no messages to process
iCal Alarm Processor Debug Logged out
iCal Alarm Processor Debug Next poll in 2 minutes