Q | Central email | Inbound destination (multihost)

Hello community,

Next a doubt:
If I maintain 2 or more mail servers in cluster, and I assign in inbound destination a FQDN of a type A record for example mail.abc.def pointing to IP 1.2.3.4 and 5.6.7.8. Once the mail is inspected by Central Email, and is going to be delivered to my mail server, the delivery will be:
-1. To both IPs to which the established FQDN resolves.
-2. To the first IP that resolves the established FQDN.
-3. To the first IP that resolves the FQDN and in case of failure, it will try the next in the list.