Mail Down and Sometimes Site unviewable?

I'm runnign a test server with CPANEL installed. Sometimes I get reports that email appears to be down but whenever I check in WHM, the information presented says it is totally fine. Usually I reboot the mail servers anyway and it fixes. Any idea what is happening?

Some users also have reported that they cannot view their site but for some reason I can using the same domain. Their domain has already propogated. Once again anyone have any idea?

Thanks.

 

 

 

 

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