Filter Calendar Invites Gmail. In gmail's webmail interface, is there a search operator to specify that the search should only return messages that are (or conversely, are not) calendar invites? To filter out accepted invitation responses:
Unmark senders as known, to avoid unwanted invitations and spam. To help keep your google calendar free from spam, you can now select an option to display events on your calendar only if they come from a sender you know.