Hier der Code:
mailSchedule(false, 1, strtotime('+3 month'));
mailSchedule(false, 2, strtotime('+6 months'));
mailSchedule(false, 3, strtotime('+9 months'));
mailSchedule(false, 4, strtotime('+3 month +1 day'), array(
'status' => 'incomplete'));
mailSchedule(false, 5, strtotime('+3 month +2 days'), array(
'status' => 'incomplete'));
mailSchedule(false, 6, strtotime('+6 month +1 day'), array(
'status' => 'incomplete'));
mailSchedule(false, 7, strtotime('+6 month +2 days'), array(
'status' => 'incomplete'));
mailSchedule(false, 8, strtotime('+9 month +1 day'), array(
'status' => 'incomplete'));
mailSchedule(false, 9, strtotime('+9 month +2 days'), array(
'status' => 'incomplete'));