mail stuck in mail queue

Clients of mine are reporting that sent mails are sometimes not delivered immediately but sometimes in about 30-60 minutes from the time they are sent.

When a client reports this I check WHM/MailQueue and I see message is there but i don't know what is waiting there. How can i fix this so messages will be sent immediatelly ?

Server is Linux on redHatEnterprise Linux 3.0 with cPanel/WHM

Thanks

 

 

 

 

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