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What happens if the backup mx server is no longer in service?

Norman Manzo Nora
Last Modified: 2015-02-27
If the backup mx server (backupmail.xyz.com) is no longer in service,  but the mx records stay the same as below:

10          mailserver.abc.com      104.x.x.x
20          backupmail.xyz.com      104.x.x.x

What happens if the primary mx goes down?  What will be the experience?  Will it have a bounced email?  What options do I have to prevent this from happening?
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