Problem with resolution Domain

[Babe Meneses Beltran]

Hi all,

I hav eproblems with my domain because some net or other no found my domain, 
for example in the mail I have error like:
Domain of sender address yyy at ideay.net.ni does not exist, Bur my DNS is work 
fine, how can I to make debug to my DNS server?

Thanks in Advanced
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