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If you know how email can play a crucial role in attracting and retaining customers, then you`ve probably heard of SPF and DKIM. You may even know that SPF and DKIM are fundamental components of email authentication and help protect email senders and recipients from spam, identity theft, and phishing. The Sender Policy Framework (SPF) is a technical standard and email authentication technique that protects email senders and recipients from spam, identity theft, and phishing. Initially, the message passes SPF validation at, but it fails SPF validation at because IP #25 is not included in the SPF TXT record. can mark the message as spam. To work around this issue, use SPF with other e-mail authentication methods, such as DKIM and DMARC. To avoid the error, you can implement a policy that anyone sending bulk email, for example, should use a subdomain specifically for this purpose. You then define a different SPF TXT record for the subdomain that contains the bulk email. Although SPF is a proven email authentication layer that has been around since the late 1990s, it presents challenges. Simply put, email is routed over the Internet and the SPF mechanism does not survive the transfer process.

Forwarding typically occurs when you send an email to someone@EXAMPLE.ORG and that person has set up their email to be forwarded to a different address, such as someone@SAMPLE.NET. In this example, your email appears to come from an infrastructure that seems to have nothing to do with you. Companies often misunderstand how the SPF works and ask their customers to include the company`s own SPF record. However, this does not achieve anything if the company uses its own domain in the return address. When an email recipient processes an email, they look at the company`s SPF record, not the customer`s SPF record. Tip: Google Workspace uses 3 email standards to prevent spoofing and phishing in your organization`s Gmail. These standards also help prevent your outgoing messages from being marked as spam. We recommend that Google Workspace administrators always set up the following email standards for Gmail: You can still send email without setting up an SPF, but an SPF policy provides ISPs with an additional signal of trust, allowing you to increase the likelihood that your email will reach your recipient`s inbox. If you`re a business that sends business or transactional emails, it`s important to implement one or more forms of email authentication to verify that an email is from you or your business. Properly configuring email authentication standards such as SPF is one of the most important steps you can take to improve your deliverability. However, the FPS itself does not go any further; SparkPost and other email experts also recommend implementing DKIM and DMARC to define a more comprehensive email authentication policy. If you use separate IP addresses and subdomains to send your marketing and transactional emails (which we recommend), specify both IP addresses as trusted sending sources.

SPF has become extremely important for verifying which sending infrastructure can route emails on behalf of your domain. There are great benefits to implementing SPF for email. An SPF record is a DNS record that must be added to your domain`s DNS zone. In this SPF record, you can specify which IP addresses and/or host names are allowed to send email from each domain. SPF determines whether a sender can send on behalf of a domain. If the sender is not authorized to do so, that is, if the e-mail message does not pass the SPF check on the receiving server, the anti-spam policy configured on that server determines what to do with the message. One disadvantage of SPF is that it does not work if an email has been forwarded. For example, suppose the user at has configured a forwarding rule to send all emails to a account: SPF fights domain identity theft and email spoofing to protect your brand reputation. SPF is adept at preventing phishing. Otherwise, SMTP would expose your address to those who might spoofing it for spam purposes.

When an attacker tries to launch an email from your address, the receiving server`s SPF security detects it and identifies it as invalid. Using SPF shows that your company is committed to protecting itself against cyber threats, a sign that has a positive impact on your sender`s reputation.