When you set up a mail delivery server group you are able to set the priority of each server. For round robin delivery this priority should be the same for all servers in the group. Once that is set up, when you associate a domain with the group under Configuration > Routing > Mail Domains , the appliance will then load balance amongst the server group. As an example, I create a group with two servers: Description: Test 1.1.1.1 priority 10 2.2.2.2 priority 10 Then I associate the domain I want with that group Incoming mail domain name: example.com Deliver to the following server or group: test Now, mail destined for example.com will alternate between 1.1.1.1 and 2.2.2.2 I hope this helps!
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