MX record Vs NX record

What is an MX record?

MX stands for Mail eXchange. MX Records tell email delivery agents where they should deliver your email. You can have many MX records for a domain, providing a way to have redundancy and ensure that email will always be delivered.

Google Apps provides a common example of using MX Records for email delivery. When you create a Google Apps account and you want your email to be delivered to your Google Apps mail account, Google provides you with a set of MX records that you need to add to DNSimple. Here are the default MX records that Google suggests you should add:

• aspmx.l.google.com 1
• alt1.aspmx.l.google.com 5
• alt2.aspmx.l.google.com 5
• aspmx2.googlemail.com 10
• aspmx3.googlemail.com 10

Google provides you with 5 different servers that can accept your email. Each MX record includes a priority value, which is a relative value compared to the other priorities of MX records for your domain. Addresses with lower values will be used first. Therefore, when a mail agent wants to deliver an email to you it would first attempt to deliver to aspmx.l.google.com. If that server cannot handle the delivery it would then move onto alt1.aspmx.l.google.com, and if that server cannot handle the delivery then it would move onto alt2.aspmx.l.google.com, and so on.

MX records make it easy to define what servers should handle email delivery and allows you to provide multiple servers for maximum redundancy and ensured delivery.

What is a NS Record?

An NS record is used to delegate a subdomain to a set of name servers. Whenever you delegate a domain to DNSimple the TLD authorities place NS records for your domain in the TLD name servers pointing to us. For example, in the com name servers there are the following entries delegating dnsimple.com to our name servers:

dnsimple.com. 172800 IN NS ns1.dnsimple.com.
dnsimple.com. 172800 IN NS ns2.dnsimple.com.
dnsimple.com. 172800 IN NS ns3.dnsimple.com.
dnsimple.com. 172800 IN NS ns4.dnsimple.com.

We also automatically publish NS records in our authoritative name servers for each domain we are authoritative for. These NS records will appear in the System Records section of each domain’s Manage page, and will either be our default name servers (ns1.dnsimple.com through ns4.dnsimple.com) or your vanity name servers if you have vanity name servers.

If you would like to delegate a registered domain name to a different DNS provider, then you can do that through the domain’s Manage page. You cannot remove or change the NS records for your domain in the Advanced Editor page.