SPF

It is a TXT record. Receivers compare the sending server’s address with the list for the envelope sender’s domain. A record may cause at most ten DNS lookups, and forwarding can break the check.

SPF covers the sender. It says nothing about whether a recipient address exists.

• DKIM
• DMARC
• Return-Path
• DNS TXT record
• Verify a list
• Topic: Email authentication
• All terms