SMTP Error

From: Leo (anonymous_at_discussions.microsoft.com)
Date: 10/08/04 

Date: Thu, 7 Oct 2004 19:07:22 -0700

Hi Guys,
I am having some problems with a secon smtp address we
need addes to our exchange, i have followed the kb
articles and askes our ISP to point the MX A records to
our static ip (they say all is ok)

our firts email address is ok and sending/receivine mail.
the second address is where we are having problems.

I have setup the default email policy in system manager
and added the second domain.

Lets say: mydomain1.com and mydomain2.com

here is the return message when i try to send the email
to the second domain, i have also made sure the users
email addresss in the second one by default

These recipients of your message have been processed by
the mail server:
rory@ithacacoldstorage.com.au; Failed; 5.5.0 (other or
undefined protocol status)

    Remote MTA mail.alwaysonline.net.au: SMTP diagnostic:
554 <rory@ithacacoldstorage.com.au>: Relay access denied

Reporting-MTA: dns; smtp01.syd.iprimus.net.au
Received-from-MTA: dns; cpms01.int.iprimus.net.au
(192.168.20.147)
Arrival-Date: Fri, 8 Oct 2004 11:43:49 +1000

Final-Recipient: rfc822; rory@mydomain2.com.au
Action: Failed
Status: 5.5.0 (other or undefined protocol status)
Remote-MTA: dns; mail.alwaysonline.net.au
Diagnostic-Code: smtp; 554 <rory@mydomain2.com.au>: Relay
access denied

can't seem to understand why this is happening? i will
say that our isp receives all email and spam/virus scans
before forwarding on, hope this is not an issue but
mydomain1.com comes through ok so i doubt it.
What am i missing

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