Yes, that's ok. Just make sure you have a PTR record created like Rob mentioned.
From: David Mazzaccaro [mailto:[EMAIL PROTECTED] Sent: Thursday, January 10, 2008 7:43 AM To: MS-Exchange Admin Issues Subject: RE: IP addresses different Yes, but I wasn't sure if it mattered that the public outside address is different than the public incoming one??? ________________________________ From: Joe Heaton [mailto:[EMAIL PROTECTED] Sent: Thursday, January 10, 2008 10:37 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 ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
