A DNS SPF record is for:

A DNS SPF record is for:

• Identifying mail server IP address(es) authorized to send on a domains behalf
• Resolving an ip address from a fully qualified host name
• Resolving the address of a mail server responsible for accepting mail messages on behalf of a domain
• Resolving an alias name to a host 

EXPLANATION

A Sender Policy Framework (SPF) record is a type of Domain Name Service (DNS) TXT record that identifies which mail servers are permitted to send email on behalf of your domain. The purpose of an SPF record is to detect and prevent spammers from sending messages with forged From addresses on your domain.  

An SPF record is a Sender Policy Framework record. It's used to indicate to mail exchanges which hosts are authorized to send mail for a domain. It's defined in RFC 4408, and clarified by RFC 7208. SPF record format. SPF records are typically defined using the TXT record type.