What is the difference between SenderID and SPF?

Sender Policy Framework (SPF) and SenderID are almost identical; however, they look at the domain in different parts of the email and appear differently in the Domain Name System (DNS):

  • SPF looks at the domain listed in the MailFrom (MFrom) address
  • SenderID looks at the domain listed in the From address

An SPF record would start as v=spf1, while a Sender ID record would start out as spf2.0/pra.

Note: SenderID is outdated and not used by mailbox providers, including Microsoft. Senders should authenticate emails using SPF.

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