Change DNS for backup email server

I am trying to setup a backup email server. I have 2 MX records:

MX @ mail.canadaka.net 10
MX @ mail2.canadaka.net 20

i think thats right. the mail(2).canadaka.net are cnames that point to the 2 ips of the servers.

But to check email users use mail.canadaka.net as there pop server. So when they check that it will be looking at the first (10) server ip still.. and will fail. How do you get it to look on the backup server?

if i am understanding this right the MX is only good for emails being sent to @canadaka.net to be routed to either server.

 

 

 

 

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