Just pay attention to how your MX, SPF and PTR records are set up in DNS.
________________________________ From: Joe Heaton [mailto:[EMAIL PROTECTED] Sent: Thursday, January 10, 2008 9:37 AM To: MS-Exchange Admin Issues Subject: RE: IP addresses different Yes, outgoing traffic would appear to come from the external port of your firewall. That's how it works. Joe Heaton ________________________________ From: David Mazzaccaro [mailto:[EMAIL PROTECTED] Sent: Thursday, January 10, 2008 7:35 AM To: MS-Exchange Admin Issues Subject: IP addresses different Hi all, I have 5 public IP addresses from my ISP. One of them is x.x.x.A which is assigned to the outside interface of my firewall. Another one is x.x.x.B and is the static mapping for SMTP to my Exchange server. So, when we send outgoing email, the return path is shown as x.x.x.A (the outside interface of our firewall). However, our MX record is configured in DNS to go to x.x.x.B so incoming email hits x.x.x.B and then the firewall maps that to 192.168.x.x (our Exchange server) Is this setup ok? (i.e. is it ok to have a different sending IP than a receiving one?) -Dave ************************************************************************************************** Note: The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. ************************************************************************************************** ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
