I'm in the process of helping a client to migrate their mail server, both are cPanel.

What are the recommended procedures in doing the migration for the same domain without lost of email while DNS are propagating?

Please help.

Thanks!

RS.

There are two options really:

1. Set all DNS zones in server1 to point to server2 (usually takes a while unless you have some sort of automated script that will modify the DNS zone file)
2. Have the client setup two email accounts in his email program. One would use server 1's IP for incoming and outgoing, while the second account would use the IP of server 2 for incoming/outgoing.

Hope this helps. :)