Mail and OS: how they works with dns

Hi to all.
I need an help to understand.
I have a domain, "pippo.it"; this domain has an MX set in this way:
pippo.it MX mail.pippo.it
mail.pippo.it A 151.99.0.100 ; Wan 1
mail.pippo.it A 91.45.98.76 ; Wan 2
With this setting I'm sure that if one line does down, my email server is always available for the other line.
I made this setting and I watched the server and all seems to be running fine; with Wan 1 down, I always receive emails.
The problem I have is when I try to download emails from a client.
IF my mac, during resolving of mail.pippo.it, receives the IP that belongs to the line down, it's not able to try the second one.
Can anyone explain to me HOW the OS and Apple mail works in this situation?
Any suggestion is welcome!
Rob
Pls save XServe!

No problem with Calendar but Mail keeps syncing with the server.  The activity window is full all the time - apparently re-syncing though no new mail is downloaded.  Rang in but they have no idea what's causing it and have sent diagnostic to engineers.  In 10.8, just a quick burst of activity when mail was checked for but now it's constant.  As a result, emptying the Deleted Items mailbox is very slow.  Am worried about the amount of bandwidth being eaten up.

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