AI & Automation

SPF Record

Definition — SPF Record

An SPF (Sender Policy Framework) record is a DNS TXT record that specifies which mail servers are authorized to send email on behalf of your domain, helping receiving mail servers verify that incoming email is legitimate. For SaaS companies running cold outreach or marketing emails, correct SPF configuration is foundational to email deliverability and preventing email spoofing.

Quick Answer

What is an SPF Record?An SPF (Sender Policy Framework) record is a DNS (Domain Name System) text record that lists the mail servers authorized to send email using your domain name. When a receiving mail server gets an email claiming to be from your domain, it looks up your SPF record to verify whether

What is an SPF Record?

An SPF (Sender Policy Framework) record is a DNS (Domain Name System) text record that lists the mail servers authorized to send email using your domain name. When a receiving mail server gets an email claiming to be from your domain, it looks up your SPF record to verify whether the sending server is on the authorized list. If the sending server is not listed in your SPF record, the email may be marked as spam, rejected, or fail DMARC alignment checks.

SPF Configuration for SaaS Email Infrastructure

A SaaS company sending email from multiple services (G-Suite for internal email, SendGrid for transactional email, Mailchimp for marketing email, and a cold email tool like Instantly.ai) must include all of these sending services in their SPF record. The SPF record looks like: v=spf1 include:_spf.google.com include:sendgrid.net include:mailchimp.com ~all. The ~all at the end (SoftFail) is generally preferred over -all (HardFail) because SoftFail marks SPF failures as suspicious rather than rejecting them outright, reducing the risk of legitimate email being incorrectly blocked during SPF troubleshooting or edge cases.

Frequently Asked Questions

What is the SPF lookup limit and why does it matter?

SPF records have a maximum of 10 DNS lookup operations (include, a, mx, ptr, exists statements that require DNS resolution). Exceeding 10 lookups causes SPF evaluation to fail (PermError), which can cause email deliverability problems. Many SaaS companies with multiple sending services accidentally exceed the 10-lookup limit. Use SPF Flattening tools (AutoSPF, dmarcly.com) to convert include statements into static IP addresses, reducing lookup count while maintaining comprehensive authorization coverage.

How do I verify my SPF record is correctly configured?

Tools for SPF validation: MXToolbox (mxtoolbox.com/spf) provides free SPF record lookup and syntax validation, Google Admin Toolbox (toolbox.googleapps.com) for G-Suite email verification, mail-tester.com (send a test email and receive a deliverability report including SPF, DKIM, and DMARC results), and DMARC Analyzer (dmarcanalyzer.com) for comprehensive authentication reporting. Always test SPF configuration after any change by sending test emails to mail-tester.com and confirming the SPF check passes before deploying new configurations.

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