Can not send email to Yahoo

Hi,

I have an Windows 2003 Standard Server with IMail Server setup on it.

I can receive email very good.

I can send email to GMail, to hotmail and other domain good too.

But, i can not send email to Yahoo. When sending, the Outlook said that email was send. I view in the mail queue (IMail Server Queue) and that email was sent. But in Yahoo Email Account, i receive nothing (inbox, Bulk....)

I ask Yahoo and Yahoo said that this cause by my DNS?

Is there any solution for this case?

Thanks and sorry because my bad English

 

 

 

 

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