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What is SPF?

Sender Policy Framework, or SPF, is one of the most commonly used email authentication protocols. Although SPF can be used by itself, the DMARC standard uses both SPF and DKIM to validate email. 

To effectively implement SPF on your domain, you would need to have a valid SPF record published on your DNS. Our Power Toolbox has a range of tools that would let you generate and check your SPF records.

Here’s how email is authenticated using SPF:

  • As the owner of the sending domain, you publish SPF TXT records onto your DNS. These records contain a list of all the IP addresses or servers that are authorized to send emails from your domain.

  • When an email is sent from your domain, the receiving email server checks the SPF record on your DNS. 

  • If the sender’s IP address or server matches one that’s on the list, the email is authenticated. If none of the IP addresses match, the validation fails.

  • Emails that pass SPF authentication are allowed to reach their destination inboxes, while those that fail might not.

PowerDMARC makes SPF even more effective with PowerSPF. It just takes one click to optimize your SPF records and stay under the limit of 10 DNS lookups. This ensures that legitimate emails from your domain never fail authentication.

PowerDMARC is the author of this solution article.

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