: If I update my existing MX records, will I stop receiving mails for 72 hours I used the Google's "Check MX" application to check the functioning our website's MX records. It showed a critical

@Alves908

The transition should be seamless.

In this case, where the email is working OK in its current (albeit slightly wrong) state and the correction will still send emails to the very same server then there would not seem to be anything to worry about.

To speed up the propagation you can reduce the Time To Live (TTL) on the DNS record to something like 300 seconds (5 minutes) a few days before you make the change, and change it back again afterwards. This is the length of time that DNS servers should cache the value. If the cache period is long then it will obviously take longer for the caches to expire and the records to propagate.

The DNS isn't "switched off" when it is changed, as you seem to fear. The DNS suddenly switches from the old to the new setting, except that this switch occurs at different times on the different DNS servers, somewhat dependent on the TTL.

The only time when this can be a little "tricky" is when you are changing to an entirely different server. What can happen is that whilst the DNS propagates some emails are sent to the old server and some to the new server. Although no emails should actually be lost. Again, reducing the TTL prior to making this change can reduce this problem.

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