About Email Magnifier email validation:
learn about DNS and MX records

DNS

Domain Name Servers (DNS) acts as like an internet phone book.
In DNS there is a list of domain names and Internet Protocol (IP) addresses corresponding to them.
People use the domain name addresses which are translated to IP addresses by machines with help of the DNS.
The information from all the domain name servers existing on the Internet is gathered together and housed at the Central Registry and is being renewed regularly.
Let’s check what happens if you want to visit a web page. You type a web page address, e.g., www.google.com, your Internet Service Provider directs you to the
IP address corresponded to this web address (172.217.164.142 is the IP for google.com) with the information received from the Domain Name Servers.
The registration of a new domain name or updating of the existing domain name in Domain Name Servers worldwide can take from 12 to 36 hours (propagation period).

MX

Mail Exchange Records (MX Records) direct email delivery agents where they should deliver your email.
One domain may have several MX records, which ensures that the email will be delivered in case one of the servers is inaccessible.
E.g., Google Apps provides you with 5 different servers that can accept your email:

• gmail-smtp-in.l.google.com 5
• alt1.gmail-smtp-in.l.google.com 10
• alt2.gmail-smtp-in.l.google.com 20
• alt3.gmail-smtp-in.l.google.com 30
• alt4.gmail-smtp-in.l.google.com 40

All MX Records of the specific domain are rated, and the MX records with relatively smaller priority are to be used first.
For example, emails sent to Google mail addresses would be first directed to gmail-smtp-in.l.google.com.
In case this server cannot respond, they are redirected to alt1.gmail-smtp-in.l.google.com.
If this server is inaccessible, the emails go to alt2.gmail-smtp-in.l.google.com, and so on.
MX records help to define what servers should handle email delivery currently. Thus the email delivery is insured.