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What is MX records and how it should look?
"MX" is the short name for "Mail Exchanger", this is type of DNS (Domain Name System) record. DNS is the key to a service for a domain. Mail server that sends email message looks up for MX records for destination domain to find destination mail sever.
"MX" DNS record looks the following way:
# dig mx google.com
;; ANSWER SECTION:
google.com. 585 IN MX 30 alt2.aspmx.l.google.com.
google.com- destination domain name.
MX -record type.
30 - priority of mail server.
alt2.aspmx.l.google.com - mail server name.
585 IN - Service information, such as TTL. Not a part of "MX" DNS record.