Changing servers, want to make sure Googlemail doesn't go down

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http://serverfault.com – 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: http://www.intodns.com/scirra.com 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 emai (HowTos)