How to implement the availability of DNS records for two providers?

Question

Domain Name System

There are two providers and a mail service inside the enterprise network available from the outside through two providers. I want to make sure that the DNS record is automatically changed if one of the providers is unavailable.
Task example:
Yes:
Zone - example.com
Record - mail.example.com A 1.1.1.1 Provider1 -
address 1.1.1.1
Provider2 - address 2.2.2.2 pointed to Provider2 with address 2.2.2.2

Answer 1

This is done in a completely different way. You make two MX servers, two entries, but with different priorities.
mx10.mail-server.com - 1.1.1.1
mx20.mail-server.com - 2.2.2.2
Mail server and two IP addresses (providers)

Answer 2

Make two A records. The DNS client will substitute them or round robin or try to take the next available one from the list if the first server did not respond.