troubleshooting Question

SMTP setup question

Avatar of MCPJoe
MCPJoeFlag for United States of America asked on
3 Comments1 Solution354 ViewsLast Modified:
Ok, I have a quick setup question regarding SMTP smarthosts and Exchange 5.5/2003.  I still have a mixed move Exchange site with both Exchange 5.5 and 2003.  I use a single Exchange 5.5 server with the IMC for all outbound email.  Even Exchange 2003 routes mail to this Exchange 5.5 server for outbound messages.  Here is what I want to setup, so someone check my plans and see if you can find anything wrong with it..

1. Setup new SMTP server in front of our SPAM appliance, inbound mail will be accepted for valid domains only and checked against an LDAP lookup.  Then forwarded on to our SPAM appliance.  Messages will get scanned for SPAM and then forwarded to our main Exchange 5.5 server with the IMC installed.  

2. Configured this same Exchange 5.5 server with the IMC, to use a smarthost and route all outgoing mail (SMTP external messages) and use this same new SMTP server as a smarthost.  

My first question would be, if I do this, will the new SMTP Server I setup be able to relay outbound mail and accept inbound mail?  If its configured to relay all mail to my Exchange 5.5 server, won't trying to send outbound mail through it as well, re-route mail back to my Exchange 5.5 server?  

What I'm trying to accomplish is a reduction of backscatter and misdirected NDRs.  I need more control of NDRs than Exchange 5.5 gives me.  I am not yet ready to migrate to Exchange 2003 for our inbound and outbound mail systems yet.  This setup should also reduce problems with our spam system as it currently gets overloaded and there are known issues with their SMTP service.  So fielding mail with a new SMTP service on a different machine should relieve some of our SPAM system problems.  A side issue we are having right now, is that we are getting blacklisted on various blacklists due to spoofing and mis-directed NDRs.  I need to better control inbound mail which will reduce NDRs from the inbound side, but also use a smarthost to control how outbound mail is sent and over which server and IP range.  Any suggestions are welcome.
Solutions Architect

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 1 Answer and 3 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 3 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros