SMTP outgoing IP, reverse lookup
Posted on 2010-08-30
I am trying to get reverse lookup to work with an smtp server.
Here is my situation: I have several servers behind a cicso asa5500 firewall. Two of the servers are configured for SMTP. These are web servers that generate email traffic.
The web servers use NLM (server farm), and have many IP’s associated with them. When an email is generated, I think the IP address used by the SMTP server is the first one in the list. In my case, it is 192.168.1.50. The NLM address that is used by the server is 192.168.1.119. This is part o the NLM cluster.
The message goes through the router, and the actual from address is the routers address, not the address that is mapped to the SMTP server.
I’m not sure how to fix this. It doesn’t appear that there is any control over which IP the SMTP server uses. I think I need to control the from IP address.
Not sure if I can control the IP address used in the cicso router or not.