The default invitations which iCal Server sends may be seen as spam by Spam Assassin (score of 5.8 or so), because of a large picture attachment.
The workaround for this I found was to modify the template for the invitation to eliminate the attachment.
The templates for iCal Server invitations are located in: /usr/share/caldavd/share/email_templates.
I changed mine so they are straightforward but at least not seen as spam. For example, my invite.html is:
<html> <head></head> <body> <p>Event: %(summary)s</p> <p>Organizer: %(htmlOrganizer)s</p> <p>Location: %(location)s</p> <p>Date: %(dateInfo)s %(recurrenceInfo)s</p> <p>Time: %(timeInfo)s %(durationInfo)s</p> <p>Description: %(description)s</p> <p>Attendees: %(htmlAttendees)s</p> </body> </html>
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