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SPF

Sender Policy Framework

A record DNS which indicates which servers are allowed to send emails for a domain.

TopicIT knowledge → About 1 min read

Simple definition

SPF helps recipients to check that a server has the right to send a message to your domain name.

Technical definition

Sender Policy Framework is published in a TXT record. The recipient server compares the sending IP address to the declared mechanisms and applies a result like pass, fail or softfail.

What is it used for ?

Reduce domain usurpation and improve the delivability of legitimate emails.

Practical example

The domain allows Microsoft 365 and the server of the website to send messages.

Common issues

  • Several recordings SPF
  • Exceeding 10 searches DNS
  • Forgotten shipping service.
  • Too permissive use of +all

Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.

Related resources

Relevant topic DNS Understand how DNS translates domain names into IP addresses, which records it uses, how caching works and the most... Relevant topic SMTP The protocol used to send and transfer emails Relevant topic DKIM A cryptographic signature added to the emails to verify their integrity and origin declared. Relevant topic DMARC A policy DNS which combines SPF and DKIM to combat the usurpation of email domains. Relevant topic Phishing A fraud technique that imitates an interlocutor or service in order to steal information or provoke action.
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