Second email domain in Exchange 2003 rejecting all messages

Posted on 2006-05-24
Last Modified: 2010-03-06
We have recently changed from POP collection of our two domains to a direct smtp feed on our Exchange 2003 Server.  I have configured the secondary domain ( in the recipient policies as and checked that i can ping the domain from an external source (it returns the correct ip address).  The primary domain ( is working fine. users can send email but messages sent to them get rejected with the following;
There was an smtp communication problem with the recipient's email server. Please contact your system administrator. < #5.5.0 smtp;550 <>, Recipient unkown>

I can telnet into 25
helo gets a response but no matter what mail from address i put in i get a rejection '501 5.5.4 Invalid Address when the address is fine.

I'm thinking it's some sort of dns issue but any help is greatly recieved!!
Question by:bandmak
    LVL 35

    Expert Comment

    > I have configured the secondary domain ( in the recipient policies as

    There is a small check box over there.. "Exchange is responsible for mail delivery for this address"

    is that checked
    LVL 2

    Author Comment

    Yes it is checked
    LVL 4

    Expert Comment

    Have you applied the policy? (right click it and click "apply this policy now")
    LVL 2

    Author Comment

    yes it has been applied!
    LVL 2

    Author Comment

    This is now resolved.....

    Even though i had disabled POP collection via the Wizard i had to actually delete the entries before the secondary domain collection would work.

    Thanks for the suggestions!

    Accepted Solution

    Closed, 500 points refunded.

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