Ok so i am planning to move our mail server out of virtualmin and to an active syncing and calendar sharing groupware. basically my questions are
1. I could possible have only one MX record point to the new mail server, but i am thinking incase of something going wrong with this new server i want to still be able to recieve email to my present server. So should i just create another MX record and manage this with the DNS mail priority number. Have higher priority for the newer server? is this the best practise?
2. I am wondering if there is an easier way to migrate emails from virtualmin based server to another one? any ideas ? i typically i just use outlook / thunderbird to migrate the emails manually.