How to check MX records?
MX records are compulsory in case you want to custom the email address for your domain. The email servers check the MX records of any server of any email domain before sending them an email. If the MX record is not present, then you cannot send emails.
With KDMARC's MX Record feature, you will be able to see if a domain has an MX record. You simply need to enter a domain name and it will display the MX record of that domain if it has been set up.
MX Lookup Tool gives you a simple interface to get information about mail servers that are responsible for accepting emails within the specified domain. This information is stored in so-called MX records in the Domain Name System (DNS).
Each MX record specifies a mail server, its preference value and it also contains the TTL (Time To Live) value. The remote client that wants to send an email to an email address within the specified domain will first try to contact the mail server with the lowest preference value. If more servers have the same value set, the client should randomly determine their order.
The TTL value specifies how long the MX record stays valid. DNS heavily uses cache and it is the TTL value of the record that says when the cached information expires and should be refreshed.