I successfully installed the postfix and configure all the settings according and receive mails properly but mail that i received are very late after the 10 min. or 15 min. of checkin or checkout if is there any solution than please help me
This is the expected behaviour - checkout and checkin notices should not be processed more often as you will end up with multiple emails send for one checkin/chekout session. The process_message_queue.pl cronjob is therefore scheduled to run every 15 minutes.
if i want to change the cronjob time for process_message_queue.pl 15 min. to 1 min than is it possible if yes than how?
Please use the mailing lists or IRC chat for support questions (this is why I had closed the report). You can change your cronjob setting, but I would not recomment in this case for the reason given - you will end up sending a lot of emails to the patrons unintentionally.