SBS2000 (Exchange 2000), domain in server does not match mail addresses, result. 550 relay error.

Hi.  

I have taken over a site that has SBS2000.  All is cool except the email.

SBS Domain is registered as dandl.co.uk, but the exchange 2000 users have had user@dandlground.co.uk manually added.

If I try to send mail to the administrator@dandlground.co.uk, I get......................

<administrator@dandlground.co.uk>:
xx.xx.xx.xx does not like recipient.
Remote host said: 550 5.7.1 Unable to relay for
administrator@dandlground.co.uk
Giving up on xx.xx.xx.xx.

Im getting nowhere very fast as I have checked that the administrator has this mail address in the list and is is set as primary.  

Argggggh!

Please help..........
SubsidiumAsked:
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alshahnazCommented:

see the below site
http://www.experts-exchange.com/Networking/Email_Groupware/Q_20692892.html

see if u are int he blacklist

Shahnaz
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SubsidiumAuthor Commented:
Not blacklisted, but does help if the recipients policy knows about the other damned domain.

Doh!
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