If our main site goes down and mail needs to be delivered to our secondary site where we are hosting a seconday mail server what steps need to be taken on our DNS A records and MX records?
I know that our current MX record is pointing to our ISP here where our primary site is, but when that site goes down what changes do I need to make with the DNS records on our domain regitstrar site?
Our mail.domain.com MX record that was pointing to its current IP address needs to be changed to the others sites external IP address. Do I change that manually or do I setup another MX record with that secondary site IP and have th eoriginal MX record forward emails to that one?
Just need to know the best solution, thanks.