blocked using dsn.rfc-ignorant.org

We're all getting this error when trying to send messages to a local university.  They said we have to work it out with rfc-ignorant.org.  

"Service unavailable; Sender address [RGT@mydomain.com] blocked using dsn.rfc-ignorant.org; Not supporting null originator (DSN)>"

Anyone know how I can resolve this?

Thanks
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taborrgAsked:
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Chris DentPowerShell DeveloperCommented:

Put the recipients domain into the lookup here:

http://rfc-ignorant.org/

And see if they're listed (or yours, and see if you're listed).

That particular error message suggests that the recipient has been black listed for blocking mails with a blank Sender address.

Chris
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taborrgAuthor Commented:
Thanks!
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