Delayed emails

Hello,

I am having some troubles on a server that is running CPanel. For some reason, peoples emails are getting delayed. They will send them out, and for some reason or another it will take a couple of hours to finally get delivered. This is not a problem for local addresses, those are delivered instantly. The server is running Red hat 7.1

Any ideas on why this would be happening?

Thanks!

 

 

 

 

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