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Is it possible for a quick Godaddy to Google Apps email migration?

Hello Experts,

I just want to say I'm fully aware of the questions asked before regarding MX records. I did my homework and searched a lot on the site.

What I'm looking for, is a recommendation for a seamless MX record change for a client that I have. They currently have 6 users setup at Godaddy.com for their web/domain hosting, as well as email.

I'm moving them to Google Apps for email, but they want to try to avoid downtime.  I've seen some Google Resellers promise that they can do the switch over in about 20 minutes. On the internet and basic logic tells me, MX propagation takes 24-48 hours.. but I want to keep an open mind about this. 20 minute changeover sounds pretty good. The question is, how would I be able to do that?

I've seen many people suggest to use a backup MX record of a higher value, and just change the priority when you're ready to go live. I've also seen people say that it wouldn't work because the mail gets split and it just doesn't work that way; that it would split 60/40.

So, what do you guys recommend is the most seamless way possible from Domain A to Domain B?

p.s. I know I tagged Exchange, but there's really no other zone that's related :)

THANKS!
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sinister_kris
Asked:
sinister_kris
1 Solution
 
ridiCommented:
Unfortunately you cannot speed up the propagation time. I even do not guess how they could avoid propagation and lowered it to 20 minutes. Propagation for you can take less then 24 hours. But to fully propagate you need to wait for some time. There will be no downtime, you will be able to send and receive emails during the propagation period but though the old mailserver.
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technofileCommented:
A simple solution is to change your DNS records to something like zoneedit.com I have used this service for a long time. You set up your DNS on zoneedit.com to point to your current servers and change godaddy to point your DNS to that ZoneEdit. ZoneEdit is free for up to 5 domains. Once godaddy updates  its records, you can test it by setting up a subdomain like ww3.yourdomain.com on zoneedit and wait for resolution to take place you can then update your mx records instantly and change it as many times as you want to where ever you want instantly. This works great if you need to move your domain from one host to another, or just part of it.
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technofileCommented:
The only time, which no one has control over is if someone has cached the ipaddress which is not commonly practiced with email, only websites.
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MesthaCommented:
MX record information is routinely cached. No one can guarantee the change will be 100% effective in 20 minutes, because no one has complete control over every server on the Internet.

It can be live in 20 minutes, it can be accepting email in 20 minutes, but seamless? Not possible.

If you had complete control over one side or the other then you could simply block port 25 on the old solution and force all traffic to the replacement. Alas you do not, so you need to plan for the full 48 hour propagation time.

I have seen email coming to old MX record hosts for some time after the MX record host has been changed. The information is cached, Exchange does it for example.

Simon.
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technofileCommented:
Mestha,

With Exchange if an email is kicked back undeliverable because of a cached MX would it not look it up to make sure it was sending it to the correct place?
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MesthaCommented:
Nope.
If the email is kicked back for some reason it fails. Exchange doesn't look up again. Exchange would only do a fresh lookup if the email was rejected with a 4.x.x error (temporary) or failed to connect completely.

That is the standard behaviour of MTAs, it isn't just Exchange that does that.

Simon.
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sinister_krisAuthor Commented:
Simon,

Does technofile's answer sound feasible also?
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MesthaCommented:
You still have caching going on. If they are using similar technology to dynamic DNS providers then it will catch most things. However no solution can give you a 100% guarantee of all traffic going to the new provider exclusively in less than 48 hours.

Simon.
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technofileCommented:
Yes it is dynamic dns. But as Simon said nothing with the internet is ever 100% but in my opinion and experience it works very well and very fast.
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