Which DNS record types are used when sending email?

Which DNS record types are used when sending email?

• A
• NS
• All of these
• MX 

EXPLANATION

Mail exchanger record (MX Record)—specifies an SMTP email server for the domain, used to route outgoing emails to an email server. Name Server records (NS Record)—specifies that a DNS Zone, such as “example.com” is delegated to a specific Authoritative Name Server, and provides the address of the name server.