550 address unknown

Posted on 2011-10-31
Last Modified: 2012-05-12
I don't know why, but all of a sudden, when people send us emails, the senders are getting their emails returned iwth 550 address unknown (state 14)

I haven't made any changes to exchange, so that's strange.   I host my own exchange server server 207 SP2.

I checked and everything looks good there.
Question by:afacts
    LVL 15

    Accepted Solution

    This is probably one of those issues where you will need to tell us the domain to more quickly assist you with this issue.

    Author Comment

    actually, I figured it out, since I upgraded my firewall, I'm experiencing issues here and there, so it's an option with my firewall. I turned it off for now.  Thanks for your willingness to help.
    LVL 7

    Expert Comment

    Can you attach the ndr?

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