Hello sir 
 Thanks for your reply . 
I want to say .  I have VPS with CWP . my IP is going blacklisted again and again . 
so I set hourly email =2 for package . still any I can send any no of amount email .  Please take a look on screenshot 
http://prntscr.com/pq7fotI have many wordpress site . I dont know  how lots of email are sent . 
here is my Mail Queue list Please take a look screenshot 
http://prntscr.com/pq7hw4 so I want to stop email from code . ( but it should work from webmail ) . 
also if there any option to set limit for any domain . 
I hope you understand . Please let me know if need anything from myside . Thanks again