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• 03-19-2007, 10:13 AM

  ChrisConway Joined on 03-19-2007, 2:07 PM Posts 4

  Changing the Outgoing IP Address in SMTP Reply Contact Using Win2K server - apparently for outbound email the SMTP service is using the default IP address on the NIC card as the IP seen by the receiving mail server.  How can I change this? For example my server has multiple IPs defined.  The default NIC is x.x.x.10.  So when email servers receive email sent by my server it shows this:   Received: from outgoing.mydomain.com ([x.x.x.10])However, I want it to show a different IP defined on that server, like this:  Received: from outgoing.mydomain.com ([x.x.x.25])I have the IP for the virtual smtp service set to use .25 but it doesn't matter - the headers when seen by incoming mail servers show x.x.x.10.This creates a problem because of spam checks and RDNS.  For instance x.x.x.10 resolves to www.mydomain.com.  So when mail servers look up RDNS for x.x.x.10 they get www.mydomain.com insetad of outgoing.mydomain.com.  This can cause spam checks to fail.I configured the SMTP service to use outgoing.mydomain.com as the outbound mail server name, which is being transmitted properly.  Its just that I want it to use the .25 IP instead of .10. How can this be configured? Does the MS SMTP service provide this flexibility? Thanks, Chris

  Tags: IIS install and setupSMTPIIS6IISIIS smpt speed

• 03-22-2007, 11:52 PM

  In reply to

  steve schofield Joined on 06-10-2002, 4:54 PM MI Posts 3,929

  Re: Changing the Outgoing IP Address in SMTP Reply Contact The SMTP service is pretty basic and uses the default NIC most of the time.  By default the SMTP service binds to all ips.  You can turn this off. http://support.microsoft.com/kb/281760  If you turn this off, you might be able to bind to the .25 address. Steve Schofield Windows Server MVP - IIS http://weblogs.asp.net/steveschofield http://www.IISLogs.com Log archival solution Install, Configure, Forget

• 03-23-2007, 12:28 PM

  In reply to

  ChrisConway Joined on 03-19-2007, 2:07 PM Posts 4	Re: Changing the Outgoing IP Address in SMTP Reply Contact Thanks Steve, I'll let you know how it turns out.

• 03-23-2007, 1:29 PM

  In reply to

  ChrisConway Joined on 03-19-2007, 2:07 PM Posts 4	Re: Changing the Outgoing IP Address in SMTP Reply Contact Ok I tried the metabase edit and I didn't change anything, I think that helps when you have binding problem with multiple SMTP servers.  I don't have a binding problem with the servers, I can send through any of the IP's but they always only come from one of the IP's.

• 03-23-2007, 5:11 PM

  In reply to

  steve schofield Joined on 06-10-2002, 4:54 PM MI Posts 3,929

  Re: Changing the Outgoing IP Address in SMTP Reply Contact Hi, I'm not sure then.  All IIS SMTP mail servers I run and have experience use a single IP and are used for outbound.  You might want to check at http://www.msexchange.org to see if there is a workaround.  This a good resource for Exchange and related things.  Steve Schofield Windows Server MVP - IIS http://weblogs.asp.net/steveschofield http://www.IISLogs.com Log archival solution Install, Configure, Forget