e-mail bouncing back

i received e-mail from info@hindujaintemple.org but when i reply

i get an outllok error
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
i am using outllok 2007 andexchange 2010 standard
i checked in mxtoolbox .com and typed the domain hindujaintemple.org
i got IP 66.96. 142.51 WHAT NEXT SHOULD I DO

how do i resolve

i am not blacklisted in barracuda

Who is Participating?
Razi_AhmedConnect With a Mentor Commented:
5.1.1 just says that there is no user in that domain with that email address. Make sure the address has not been changed at the other side.
pramod1Author Commented:
but i just received e-mail a minute ago and i was replying back
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