DNS
A record
A DNS record that maps a domain name to an IPv4 address. Mail for a domain with no MX record goes to its A or AAAA address instead.
Definition
An A record (address record) is a type of DNS record that maps a domain name to its corresponding IPv4 address. When someone tries to access a website or send an email to a domain, the A record tells the internet which server to connect to. For email, while MX records are more commonly used for mail routing, a domain with no MX record receives mail at its A record (or its AAAA record, for IPv6) instead.
Examples
example.com → 192.0.2.1mail.example.com → 192.0.2.25
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