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Exchange 2003 MTA Settings

I've had mail bounce back to me from verizonwireless recently.  I telnet-ed to their mail host and got the following message.  I've checked senderbase.org and it does not state that we are on any restricted lists.  So it must be our MTA perhaps?  Does anybody know what settings I need to change on Exchange 2003 SP1 (running on Server 2003 R2) to clear this up?  I assume we're having trouble with other mail domains too but I can personally confirm this one at this time.

554-Your access to the VZW mail systems has been rejected due to the sending MTA
 or Network Service Provider's poor reputation  / e-mail hygiene on the Internet
554-Please reference the following URL for more information:
554 If you believe that this failure is in error, please contact the recipient v
ia alternate means.

Connection to host lost.

Thanks in advance.
1 Solution
Nothing comes up in the RBL lists either:

However. your server isn't announcing itself correctly.
Or to to more precise, you have a PIX.

When I telnet in to port 25 on that IP address, the banner is this:

220 ****************************************************************************

It should be something like this:

220 IGT-IMC-02.redmond.corp.microsoft.com Microsoft ESMTP MAIL Service <Inbound
SMTP Virtual Server> Tue, 30 May 2006 16:23:49 -0700

On the PIX, disable the fixup SMTP command

What is happening is the recipient is using the SMTP banner to check whether the host is valid or not. As you aren't presenting anything in the banner, the email is rejected.

You should also ensure that your DNS is set correctly: http://www.amset.info/exchange/dnsconfig.asp

STorabiAuthor Commented:
Sembee, thanks very much for the response.  Although I can't verify your theory at this time (I am sadly not the firewall administrator).  I will award you the points for your clear explanation and supporting links.  Thanks
Anthony H.Commented:
so there was no solution. i'm having the same problem but no solution yet?
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