This is round robin DNS. This is a quite simple solution for load balancing. Usually DNS servers rotate/shuffle the DNS records for each incoming DNS request. Unfortunately it's not a real solution for fail-over. If one of the servers fail, some visitors will still be directed to this failed server.
Sending on behalf of client - if we want to add 12 unique IPs for a mail delivery server for one single domain this is not possible as the maximum is currently 3. They request to add more than the maximum 3 IPs for a single domain.
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