I need someones help to insure that I am setting up SMTP on a Windows 2008 Server correctly.
I have a few applications trying to send emails through a specific SMTP IP address.
I have my websites on one Windows 2008 server (with a unique IP) and I have another Windows 2008 server (with a unique IP) set up just for SMTP purposes.
I also have a very simply PHP script that allows me to set the SMTP IP and the username and password for validation.
When I fill the form out, it seems to work fine .. EXCEPT .. if the FROM field in the form is from a few of my domains (that are on a different server and IP). But when I don't send it from the domains that seem to be giving me a problem .. it appears to work fine.
NOTE: Previously I was sending emails through a different SMTP IP (that my web host has set up and uses for the sending of all regular email). When I used this SMTP I didn't have any problems at all.
So, since I am now having these issues, I am figuring that something with my set up on the Windows 2008 server and the SMTP on the server is most likely the issue, but I don't know how to figure out what's wrong and how to fix it.
I need someone's help.
Please let me know if you can assist.