Sender Policy Framework (SPF) is an email validation standard, defined in RFC 7208, designed to combat email spoofing.
An SPF record increases your domain’s credibility and reduces the chances of getting delisted by the spam filters. It helps legitimate emails find their way to users more quickly. As the result, an SPF record can help you prevent your emails from being flagged as spam by other servers: if the receiver’s server finds no SPF record, then it would send a “hard” or “soft” fail message to the sender. Over time, bounced emails or emails marked as spam can impact the domain’s ability to reach users, compromising efforts to communicate with users.
Additionally, an SPF record prevents your emails from various attacks. If emails are not authenticated, companies and email recipients are at risk for phishing attacks, spam emails, and email spoofing. Such attacks can harm your users, which will further harm your reputation. By restricting the sending of emails to only authorized IP addresses listed in the records will increase the difficulty for attackers to imitate a domain, reducing the likelihood of these attacks.
To sum up, an SPF record:
- Improves email deliverability
- Increases email security
- Protects domain reputation
Learn more about adding an SPF record here: SPF authentication