Is it possible to use one domain has backup MX server for another one?

Hello,

Let say I have domain1.com hosted on server1 @ location1 and domain2.com hosted on server2 @ location2

Is it possible to use domain2.com has backup email server of domain1.com and vice-versa? Cos both have very very good uptime and are more than unlikely to be down at the same time.

Thxs in advance
Ludo

 

 

 

 

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