Proper MX Record Setup

We are moving our field operations email from Godaddy to our servers internally and I am trying to figure out what the proper MX setup should be until everything is moved over. The current setup for "" is:

0 (godaddy)
10 (godaddy)
20 (our internal server)

The problem I see so far is email to test accounts internally are not being received.
Shane TaylorAsked:
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You internal server is prio 20, and is NEVER touched when the first two GoDaddy's server are responding correctly (even a bounce is marked as correctly in this case!)
To start receiving emails, either the GoDaddy servers have to be OFF LINE (not respond in any way, but probably it servers a whole range of other domains, so it probably WILL respond), or you have to set them to a higher prio, and have the new internal server with the lowest number (and hence the highest prio)

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Shane TaylorAuthor Commented:
If I set the new internal server to 0 and the others to 10,20 or whatever how will it affect mail flow for the accounts still using godaddy servers? I'm just trying to avoid those accounts not migrated losing mail traffic going into a black hole somewhere.
Sadly, it's one or the other. There's NO way you can offload migrated accounts to the new server and non-migrated users to the old servers with DNS.
Hybrid environments are done by having one server accept ALL emails, and internally distribute the migrated users to the new mail server.
DNS has nothing to do with this.
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