The choices are MX, NS, MB, SRV choose all the apply
mx
MX records.
Google and Godaddy offer tools and facts about MX records that are easy to understand and work with. MX records can be edited and added with these companies.
for MAIL/email!
An MX record or Mail exchanger record is a type of resource record in the Domain Name System (DNS) specifying how Internet e-mail should be routed using the Simple Mail Transfer Protocol (SMTP). Each MX record contains a preference and a host name, so that the collection of MX records for a given domain name point to the servers that should receive e-mail for that domain, and their priority relative to each other.
Preference
round robin
Your domain has a hosting service that stores the domain's DNS records, including the MX records CNAME and TXY records and more. With applications,you might want to modify it.
MX Resource RecordsThe mail exchange (MX) resource record specifies a mail exchange server for a DNS domain name. A mail exchange server is a host that will either process or forward mail for the DNS domain name. Processing the mail means either delivering it to the addressee or passing it to a different type of mail transport. Forwarding the mail means sending it to its final destination server, sending it using Simple Mail Transfer Protocol (SMTP) to another mail exchange server that is closer to the final destination, or queuing it for a specified amount of time. NoteOnly mail exchange servers use MX records.
Domain hosts run DNS servers for your domain. This includes A records, MX records, and CNAME records. Most domain hosts offer domain name registration as well.
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