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Exchange 2007: Mail submission failed: Error message: The SMTP host was not specified.

bridgetimiller
on
Medium Priority
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Last Modified: 2012-06-27
I'm getting an error when runnign the Mailflow troubleshooter in Exchange 2007.  I'm also running Exchange 2003 currently (although I plan on removing it once I get 2007).  I have checked everything I can find.  The one thing to note is that I don't have the public IP entered in my NIC settings yet (waiting to get one mailbox working internally...hopefully if it's even possible?)  I can send mail using a given account that we'll call News.  But I can't receive mail in News.  I tested this morning but turning our 2003 server off and adding in the public IPs, but then I could receive, but not send.  I've tried everything i can find.  I can telnet on port 25.  I think it's going to be something simple and a one click change....just can't figure it out.  Thanks!
Bridget
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Delphineous SilverwingGood Ol' Geek
CERTIFIED EXPERT

Commented:
Microsoft changed the way Windows uses multiple addresses.  Your issue may be being caused by this if you are using Windows 2008/2008r2
http://blogs.technet.com/b/networking/archive/2009/04/24/source-ip-address-selection-on-a-multi-homed-windows-computer.aspx

If the option is available, it may work better for you to setup a network address translation (NAT) in your firewall for the server and then only have the private IP in the server.
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Commented:
Giving myself the points, since I figured it out without Experts help.
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