SPF

An email security method in which a domain publishes, in a DNS (glossary)DNS Domain Name System The internet's directory that links domain names to computer addresses. Full definition of DNS TXT record (glossary)TXT record Text record A DNS record holding text, often for domain verification and email security. Full definition of TXT record, the list of servers allowed to send mail on its behalf. Receiving servers compare the sender's IP address (glossary)IP Internet Protocol The internet's basic rules for sending data, using numeric addresses for every connected device. Full definition of IP against that list. It helps reduce forged email but breaks when messages are forwarded.