Yep quite right, just as a test i did this in ow_plugins/msgall/controllers/admin.php

i basically just put an if statement  inside the foreach loop that was there to check for the number of emails. 

But you were right this did not work and it still sent all.  So i will check the library :)  Thanks 

   // added for sleep code
           $s = 1

          foreach ($allUsers as $user)
          {
           
            //as long as it is under 70 emails then process as normal
            if($s < 70)
            {         
           

               if($user->id != $admin)
               {
                $subject_new = str_replace("{user_name}",BOL_UserService::getInstance()->getDisplayName($user->id),$subject);
                $message_new = str_replace("{user_name}",BOL_UserService::getInstance()->getDisplayName($user->id),$message);
                $conversation = MAILBOX_BOL_ConversationService::getInstance()->createConversation($admin, $user->id, $subject_new , $message_new );
               }

             $s++;   //increment $s

           }else{
                 sleep(90); //sleep 90sec (1.5 min)         
                 $s=1; //reset $s
                }//close else

          }// close foreach