Hello Everyone,

Been reading up on this forum a lot and found a lot of my questions answered here; however after searching for a while, I couldn't find the answer to my dreaded sendmail problem.

Problem:

We have a "contact us" web form based on Drupal. It works perfectly fine if we set the ending recepient to be an external provider (gmail, hotmail, etc) but it does not work when we have it send to our own domain.

However, if I send it to the external domain and have it forward it to our domain, then it works.

When we have it send to our domain, there's an error message on webmin's control panel under sendmail qeued mail: Deferred Connection timed out with (our domain).

System setup

Server is a webserver running Fedora 12 and Webmin. It serves up a drupal implementation that has worked in sending out mail to our domain before; but due to a server crash, all previous settings were lost.

SendMail is the plugin that is actually sending out the mails.

The server is behind a firewall before data goes out. The mail server is on another IP in the same IP block. Both servers are NOT on the same domain.

Furthermore, neither of our IPs or domains are blacklisted and exchange are whitelisting all of our domain e-mail addresses.

Two possibilities ... or could it be more?

I concluded that there are two possibilities on this traffic flow:

1. Data is leaving the building to our ISP, then at that point, DNS is not propegating correctly to return to our mail server. (We changed our mailserver IP a week ago). However, our ISP confirmed that the mailserver is pointing to the correct IP. Therefore, is there a way I can track where the e-mail goes on my end?

2. Data is leaving the webserver, entering the firewall, detecting that the IP is within our range, routing the data to the mailserver? If this was the situation, where would you recommend to look?

Sorry i'm being such a noob