How to stop Exchange 2003 from sending IP address

Hello,
I have a rather perplexing problem. We are running Exchange 2003 on a 2003 server. The exchange server is primarily used for internal email while our ISP hosts our internet email. Most of our employees use Outlook 2000 as a mail client. The problem that I am having is that when an internet email is sent via Outlook, Exchange sends the IP address that we use as our main internet address (the one supplied by our ISP). This is a static IP as we have a buisness account. The problem with this is that one of the 'blacklist' companies (dynablock.njabl.org) because they can not do a reverse DNS lookup on it. The thing is they will never be able to because that shouldn't be the origination IP, the ISP mailserver's IP should. This is causing us problems as when we try to contact some of our customers our email gets sent back as being blocked by this blacklist. If the email is sent via Thunderbird for example it goes through without a problem. So what I want to know is if there is a way to stop exchange from inserting our IP address in to the header of the email, or at least to insert the correct IP address of our ISP's mail servers. Thanks for any help.

 

Why don't you SmartHost your mail through your ISP's mailserver? Then the ISP's mailserver's IP address will appear in the headers.

As it currently stands, there's not a lot Exchange can do by itself. The *remote* SMTP server knows which IP address is attempting to connect to it, and it's not your ISP's mailserver. It's the IP address of your Exchange box, and that appears on a blacklist.

 

Thanks Ken. I believe that has worked. I will find out Monday for sure.