In DNS check tools like intodns and dnsstuff, what are the following warnings means and how to avoid:
Different subnets : WARNING: Not all of your nameservers are in different subnets.
Number of MX records OK. Looks like you only have one MX record at your nameservers. You should be careful about what you are doing since you have a single point of failure that can lead to mail being lost if the server is down for a long time.
What is required in hosting environment/server to help have name servers and MX in different SubNets?