The info for the various gosaMailDeliveryMode flags should be put in the mail plugin doc

flags pour gosaMailDeliveryMode Example for gosaMailDeliveryMode [LR ] L - Local delivery R - Reject when exceeding mailsize limit S - Use spam filter V - Use vacation message C - Use custom sieve script I - Only insider delivery */

(from redmine: issue id 834, created on 2012-04-21, closed on 2012-06-12)