Multiple address records
Using several DNS MX record is sometime clumsy if you have many domains.
It is also possible to use one MX record per domain, but multiple address records:
example.com.              22879   IN      MX      10 mail.example.com.
mail.example.com.       22879   IN      A         1.2.3.4
mail.example.com.       22879   IN      A         1.2.3.5

Using several DNS MX record is sometime clumsy if you have many domains. It is also possible to use one MX record per domain, but multiple address records:

example.com              22879   IN      MX      10 mail.example.com


mail.example.com       22879   IN      A         1.2.3.4

mail.example.com       22879   IN      A         1.2.3.5

loadbalancing-mx-multiple_address-cluster
 

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