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mx records

Posted on 2014-12-23
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can we load balance mx records in exchange server, if yes how.

written explanatory will be a winner.
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Question by:Exchange_Don
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by:Robby Swartenbroekx
Robby Swartenbroekx earned 1000 total points
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yes:
mx records are in DNS servers, not in exchange servers, so your question is a little but confusing.
DNS records should be duplicated. over 2 or more public available DNS servers. Normally this is someting you let someone host for you.

It is possible to create 2 MX records with different priority. If the first server does not response in time, than the second server will be used.
You need 2 different public IP's to do this, if you have redundant internet lines (with different providers), it is recommended.
If you have 2 Internet facing Exchange Edge servers, you should forward port 25 of those 2 ip's to each one of them. Those edge servers can then do the content filtering en forward mails to your internal exchange server(s).
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Wilder_Admin earned 1000 total points
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Robby explained one option but on dns you have the roundrobin option as well. Means you can set 2 or mor entries with the same priority then the client who is asking for the ip of your mail server gets one of these entries. Is a kind of loadbalancing as well. The question is only can you handle that with your mail servers?

We made it by putting a web appliance in front. Like a antivirus gateway. This appliance is able in loadbalance cluster. So in our mx we have three ips in roundrobin.
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