Excahnge 2007 Can't Receive Some Internet E-mail

Posted on 2011-10-31
Last Modified: 2012-05-12
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.

Question by:LTIADMIN
    LVL 17

    Expert Comment

    Hm.  If you've just merely changed the IP forwarding from the baracuda appliance to your exchange server, then DNS MX records should not need changing.  Did you however allow your router's IP address to be an authorized relay?  Previously, you would have had a connector for your Baracuda appliance. Because the mail is coming from a different source IP, is this potentially a part of the issue?

    Author Comment

    Thanks. I've set that and will see how it goes.

    Any idea why it would have let some external e-mail through, even without that, and not others?
    LVL 9

    Expert Comment

    If not all emails are comming in and you checked your receive connectors ...
    Did you enabled Anti-Spam Functionality on your Hub Transport Server ? Any Sender Filtering ?

    Accepted Solution

    None of these seemed to help but we were able to get the Barracuda working again. Thanks for your help.

    Author Closing Comment

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