PHP Mailing Problem

Hi!

I have a customer with a very basic newsletter script. Now the problem is suppose his server address is: someone.com and he has 3 people in his newletter email list i.e:

myself@someone.com (this is customer's email for testing)
dude@someother.com
girl@coolgirls.com

now when he sends news letter he recieves it very instantly...but other people do not recieve at all why is this happening ?

Thanks!

 

 

 

 

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