We are currently moving from one server to another.
I'm new to DNS and server admin which isn't ideal I know! This is how our current working domain is set up for email with Google apps:
In preparation for moving server and changing nameserver I've created this zone on zoneedit (the current nameserver isn't with zoneedit):
And this is what the DNS looks like on the new server:
What I would like to know is when I point the domain to the new nameserver with this setup will the mail server be uninterrupted? We can't afford much downtime at all for email.
One thing I have noticed is the IP in one TXT entry refers to our old (current) servers IP which of course needs changing, but will this break the email in any way if I just modify that entry? For example, does Google need to be notified of this change at all or will it happily just pick up the changes?