I have iCal syncing with a Google Calendar account, and for some reason, some meeting invites that I accept wind up with an email alarm set for 10 minutes before the meeting. This causes iCal to send me an email through Mail.app at the appointed time.

This is a pain in the neck, because Mail.app launches if it's not open (and since I use a different client, it never is), and if I'm offline, Mail.app starts throwing up error messages. And besides, I don't want meeting alarms in my inbox.

Is there any way to completely disable email alarms in iCal? The only option I see is "Turn off all alarms" - but I don't want to turn off the pop-up windows, just the emails. I remove those alarms any time I come across them, but sometimes they slip through.