More than one server - email & DNS

I need help. I am getting a new server. I am currently in the process of moving the IP addresses and DNS records from the old server to the new one.

My concern is with the email of the old server. Do I need to create another MX record in the new DNS server to point to the old server as well? I just wander how the old server will relay email.

Any suggestions?

 

 

 

 

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