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Hossein Kholghi's List: EmailGateway

  • Can I run an on-premise solution like Microsoft Exchange alongside Google Apps?

    Set up an intermediary mail gateway that can dual-deliver mail to both Google Apps and your existing mail server. This should ensure that incoming mail is available in both systems.

  • Apr 01, 10

    www.google.com/...answer.py GmailMigration

      • Add an MX record for your mail server and remove all MX records pointing to Google after making note of their TTL (time to live) values, to be used in step 6.
         The method for changing MX records will depend on how you handle your DNS records. 
           
        • If you manage your own DNS servers then you'll need to configure your name server software. An example of software for running DNS servers is TinyDNS. You should use small values for TTL (time to live) when testing your DNS settings so that you can quickly revert changes if needed. 
        • If you have your own domain host, then you will need to use your domain host's web interface to set the MX records. 
        • If you initially purchased your domain from Google Apps, you will be using the domain host provided by Google Apps. Instructions for accessing your domain host are below: 
             
          • Log in to the control panel at https://www.google.com/a/mydomain.com (change mydomain.com to your actual domain name) 
          • Click the Domain Settings tab 
          • Click the Domain Names secondary tab 
          • Click Advanced DNS settings 
           

           You will see instructions for editing MX records on the Advanced DNS settings page. 

         
      • Verify that you have set the MX record correctly: 

         

        $ dig mx mydomain.com | grep MX mydomain.com.      1800    IN      MX      10 mta-host.com. 
         

         You should see the hostname of your mail server (shown here as mta-host.com). If the results still show MX records for the Google mail servers, you may be displaying the cached results from an earlier DNS lookup. You can try to run the command from another computer, flush the cache on your DNS server, or wait for the record to expire. 

         

      • Configure Google Apps to properly handle incoming mail from the gateway (Premier and Education Edition only): 
           
        1. Log in to the control panel to manage your domain at https://www.google.com/a/mydomain.com (change mydomain.com to your domain name) 
        2. Select the Service settings tab 
        3. Select Email from the drop-down menu 
        4. Add your inbound gateway's IP addresses to the Inbound gateway box. This will improve spam handling. Google will still provide spam filtering on mail from these servers, but proper gateway configuration will reduce the number of messages falsely marked as spam. If you're using Postini, make sure you add these addresses: 64.18.0.0/20 207.126.144.0/20.
          5.  
         

         

      • Verify that mail is delivered: 

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