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  • Nicolas Wegener

Understanding the Benefits of SPF: Verifying the Authenticity of Emails

SPF (Sender Policy Framework) is a security measure that helps protect against email spoofing, which is when an attacker sends an email that appears to be from a legitimate domain but is actually sent from a different domain.



SPF works by creating a list of authorized mail servers for a domain. This list, known as an SPF record, is published in the domain's DNS (Domain Name System) records. When an email is received, the recipient's mail server checks the SPF record to see if the server that sent the email is listed as an authorized server for the domain. If the server is not listed, the email may be flagged as spam or rejected.


The history of SPF dates back to the early 2000s, when email spoofing was becoming a widespread problem. In 2003, the first version of SPF was published as an open standard by Meng Weng Wong, a computer science professor at Carnegie Mellon University. In 2006, SPF was updated to version 1.1, which added support for "include" mechanisms, which allowed a domain to include the SPF records of other domains in its own SPF record.


So why are SPF records important for email? There are several reasons:

  1. Spam and phishing: SPF helps protect against spam and phishing attacks by verifying the authenticity of emails. If an email fails the SPF check, it is more likely to be spam or a phishing attempt.

  2. Reputation: SPF helps protect the reputation of a domain by ensuring that only emails sent from authorized servers are delivered to the recipient's inbox. If a domain's emails are frequently flagged as spam or phishing attempts, it can damage the domain's reputation and result in fewer emails being delivered to the recipient's inbox.

  3. Deliverability: SPF helps improve email deliverability by allowing recipient mail servers to verify the authenticity of emails. This helps ensure that legitimate emails are delivered to the recipient's inbox, rather than being marked as spam or rejected.

It's worth noting that SendSquared uses "_spf.sendsquared.com" as its SPF record. This means that any emails sent from a SendSquared server will include "_spf.sendsquared.com" in the SPF record, and recipient mail servers can use this record to verify the authenticity of the email.


Overall, SPF records are an important security measure for email. They help protect against spam and phishing attacks, improve the reputation of a domain, and improve email deliverability. By implementing SPF, email senders can ensure that their emails are secure and reach their intended recipients.

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