Getting error 5.7.1 on new ISP

Just changed over to a new ISP (XO Communications). I wanted to just change
my Exchange 2003 SP2 server to use their SMTP server as a smart host but
they have this dumb rule where I have to setup every user on their system as
well so when mail comes from jsmith, bjones, jdoe, etc @mydomain.com it
comes from an address they know. They won't just allow it to come from my
IP. This is a hassle to keep up to date and they also charge per account.

Instead I requested that they setup a ptr record for
myemailserver.mydomain.com which is my Exchange 2003 server's external IP
address (internal address is 192.168.x.x). Now even though that has been
setup for 5 days and I can reverse lookup the IP address 209.x.x.x which
resolves to myemailserver.mydomain.com I am getting 5.7.1 no relaying
messages from some companies. Here is the exact return message:

====================

Your message did not reach some or all of the intended recipients.

Subject: Test
Sent: 3/3/2008 11:08 AM

The following recipient(s) could not be reached:

EI_Sales@xxxxxxxxxxxxxxxxxxx on 3/3/2008 11:08 AM
You do not have permission to send to this recipient. For
assistance, contact your system administrator.
<myemailserver.mydomain.com #5.7.1 smtp;501 5.7.1 This system
is not configured to relay mail (r) from <jcnolan@xxxxxxxxxxxx> to
<EI_Sales@xxxxxxxxxxxxxxxxxxx> for 209.x.x.x>



.

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