mail-server is not working

I am facing a new type of problem if u can help me then plz help me.
when I am mailing from my server (mithilesh@classicsoftwares.com) to xyz@yahoo.com then delivery is failure and same when I am mailing from Yahoo address to xyz@classicsoftwares.com then it again failure delivery shows.But when I am mailing from my server to any other server like xyz@hotmail.com then it is working smoothly.
Can you give me what is the actual problem?

Thank you
mail-server is not working

 

 

 

 

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