Excahnge 2007 Can't Receive Some Internet E-mail
Posted on 2011-10-31
We have a single Exchange 2007 server behind a Barracuda Spam/Firewall.
Today we had problems with our Barracuda and I had to bypass it while I get it fixed. I wanted to route incoming internet e-mail directly to the Exchange 2007 server. Not ideal, but we need our e-mail.
So I go into our Firewall and change the routing. I replaced the IP address of our Barracuda with the IP address of our Exchange server. Then I sent myself an e-mail from my gmail account, got it and thought I was good to go.
Not so fast. While some outside e-mail is coming in, not all of it is. What am I missing? One solution said I should check our DNS configuration. I did and made a change there.
It used to use our internal Primary/Backup DNS servers. But at one suggestion I changed that tour our internal Primary DNS, and our ISPs primary DNS. That didn't work.