SPF, DKIM and DMARC are important technologies used to authenticate email and protect business domains from spoofing.
What is SPF?
SPF specifies which mail servers are authorized to send email on behalf of a domain.
What is DKIM?
DKIM adds a cryptographic signature to outgoing messages so receiving systems can verify that the message has not been altered.
What is DMARC?
DMARC builds on SPF and DKIM and defines how receiving systems should handle messages that fail authentication checks.