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Can't receive email from one particular domain: "does not designate (IP) as permitted sender"

Preston55
Preston55 asked
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Last Modified: 2012-05-09
Hey guys and gals,

I have no problems sending email to a particular contact - we'll call their domain 'contoso.com'.  However, when they reply to me, they get a kickback saying "<me@mycompany.com>: 550 Validating Sender: domain of user15@contoso.com does not designate xxx.xx.xxx.xx as permitted sender"

My company uses an internally hosted Exchange 2007 box, and the error being generated does not appear to be coming from Exchange.  I've been trying to find a solution to this here and on other sites but not a lot of the replies seem to make a lot of sense or point to any particular solutions.  Long story short, my question is this - is this an error on my end (the recipient) or is this an error on the sender's side? If the latter rather than the former, is there a particular article or fix I can pass along to them, since they are convinced it's on my end?

Thanks!
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