Q: How do I configure Calendar Server to send email invitations?
Calendar Server can send invitations to “external” users (i.e., those without an account on the server) via email, using the iCalendar Message-Based Interoperability Protocol (iMIP - http://tools.ietf.org/html/rfc2447 ). If you create an event and add an attendee which has an email address but does not have a local account, the server will generate an email message with a icalendar attachment containing the event details and a request for response. If the attendee uses an iMIP-compatible client to respond to the invitation, the server will parse the reply and update the organizer’s copy of the event accordingly.
What is required to set up iMIP:
Mail gateway didn’t find a token in message – Calendar Server uses “plus addressing” to encode a token into the reply-to address for email invitations. That way, when a reply comes back, the token can be used to look up the appropriate organizer, attendee, and event to update. This special tokenized email address is not only in the reply-to field, but also substituted for the organizer’s email address within the embedded icalendar body attached to the invitation. So iMIP-aware clients should direct the reply to the email address including the token. If that token is missing, the iMIP reply is not processed.
iMIP injection principal not found: com.apple.calendarserver – By default, Calendar Server assumes there is a user named com.apple.calendarserver on the system and it uses that account to authenticate requests between the calendar server processes and the mail gateway process. If you’re not on an OS X server, you’ll need to create a user account for this purpose, and put its username and password into the caldavd.plist as described in the steps above.
Q: How do I configure Calendar Server to use LDAP for users, groups, locations, and resources?