string ScheduleNewsletterQueue (string accessKey, int listID, int newsletterID, int scheduleID, string deliverydt, inttimezone)
accessKey: access key obtained using the LoginFromId method
listID: list identifier. Lists and corresponding IDs can be obtained calling the GetLists Method
newsletterID: ID of the message
scheduleID: ID of the schedule
deliverydt: a string containing date and time of scheduled delivery, in the format yyyyMMddHHmmss. If not specified, the sending starts immediately, and in case another sending is in progress the message is queued