How to change the main mailing address?

Question

Domain Name System

Good afternoon.
I have a domain (dom.com), and 2 white static addresses (xxxx + yyyy). DNS setup:
A records:
dom.com - yyyy
mail.dom.com - xxxx (used to connect OWA, Anywhere and ActiveSync)
mx1.dom.com - xxxx
mx2.dom.com - yyyy
MX records:
mx1 dom.com - 5
mx2 dom.com - 10
I want the connection to owa, etc., as well as the main mx-record to be the address yyyy MX-records are resolved correctly by both Google and Yandex, it seems like both are indexed by Internet servers. As far as I understand, I just need to change the address of the mail.tuvia.by domain, and change the priority of mx-records on the contrary, and everything will be ok. But since I didn’t set up mailers from 0 before, but only served the configured ones, there are doubts, maybe they will index them again for 72 hours - and the service is critical, and it won’t be feng shui if mail suddenly stops going outside, or remote clients connected to anywhere fall off and etc. Is it necessary to carry out additional checks (except for the resolution of mx-records), and which ones, or just do it as described above?

Answer 1

Usually DNS changes occur quite quickly, for example, I use Google's DNS server, serves Godaddy records - changes take place within 1-2 minutes. But if I use the DNS of a local dip (that one is still a brake), then more than an hour.
Make changes at the most non-critical time (Saturday night for example)