My friends, I have found the problem; and you will all shake your heads. The one single tiny thing I forgot to change when swapping the servers out on B, was to CHANGE THE GATEWAY!! I was digging through firewall rules when it finally dawned on me that I never changed the gateway so it still inherited the permissions for firewall A (which I used for testing), but not permissions for firewall B. That's why mail was still going out but nothing was coming in.
I switched gateways, and instantly see traffic popping in on my smtp log. Now to schedule a sunday to complete this migration. Thanks for the feedback! From: Joey S Sent: Friday, March 27, 2009 9:25 AM To: [email protected] Subject: Re: [qmailtoaster] Multiple Domain Issue? I understand more now, I think. Very convoluted. If you set the machine up for an IP on ISP B, then it should work just like it did for ISP A. If it does not, I would think you have a network/ISP issue. When the machine is on ISP B, try telnetting to it on port 25 (http://wiki.qmailtoaster.com/index.php/How_to_use_telnet_for_diagnostics) See if there are any issues, and watch the logs while you do so. Also check for any firewall issues. Quite convoluted, but like I said, we're in production; a single mail disappears and I get screamed at by everyone. When I did test the machine out, I couldn't telnet into port 25. I'm guessing it could be a firewall issue, but that's why I swapped out directly and even used the same ip address since our firewall is already configured to allow traffic in/out for that ip address. On that note, the current setups we have are direct mirrors. that's why I was wondering if there was something else going on since it works for network A but not network B. I'll try to do more testing and post here again with results. Need to wait for a testing window since our company also runs 24/7. Thanks.
