What happens if my domain does not have an SPF record?

Without SPF, receiving servers cannot verify that emails from your domain are legitimate. This means your emails are more likely to land in spam, and your domain is vulnerable to spoofing — anyone can send email pretending to be from your domain. Most modern email providers will penalize unauthenticated senders.

What is the SPF 10 DNS lookup limit?

SPF records are limited to 10 DNS lookups (include, a, mx, redirect mechanisms each count as one). Exceeding this limit causes a PermError, which means the entire SPF check fails — equivalent to having no SPF at all. Consolidate includes and use IP addresses directly where possible to stay under the limit.

Should I use -all or ~all in my SPF record?

Use -all (hard fail) for maximum protection once you have confirmed all legitimate sending sources are included. During initial setup or when transitioning, ~all (soft fail) is safer because it flags unauthorized senders without outright rejecting them. Start with ~all, monitor for issues, then switch to -all.

How do I check if my SPF record is configured correctly?

Use free tools like MXToolbox SPF Lookup, Google Admin Toolbox, or dmarcian to validate your SPF record. Check for lookup count, syntax errors, and completeness. Also send test emails to Gmail and Outlook accounts and inspect the email headers — look for spf=pass in the Authentication-Results header.

Glossary

What Is SPF Record (Sender Policy Framework)?

An SPF (Sender Policy Framework) record is a DNS TXT record that specifies which mail servers are authorized to send email on behalf of a domain. When a receiving mail server gets an email claiming to be from your domain, it checks the SPF record to verify that the sending server's IP address is on the approved list. If the IP is not authorized, the email is more likely to be flagged as spam or rejected entirely. SPF is one of the three pillars of email authentication, alongside DKIM and DMARC. The technical structure of an SPF record is straightforward but requires precision. A typical record looks like: v=spf1 include:_spf.google.com include:sendgrid.net ip4:203.0.113.0/24 -all. This record authorizes Google Workspace servers, SendGrid servers, and a specific IP range to send email for the domain. The -all at the end means any server not on this list should have its email rejected (hard fail). Alternatives include ~all (soft fail, emails marked as suspicious but not rejected) and ?all (neutral, essentially no enforcement). SPF matters enormously for B2B outbound because email providers like Google and Microsoft use authentication results as a primary factor in deliverability decisions. A domain without SPF — or with a misconfigured SPF record — will see emails routed to spam folders at significantly higher rates. For sales teams sending cold outreach, this means your carefully crafted messages never reach the prospect's inbox, destroying campaign performance regardless of how good the content is. Common SPF mistakes include exceeding the 10 DNS lookup limit (each include mechanism counts as a lookup, and exceeding 10 causes the entire record to fail), forgetting to add new email service providers when onboarding them, using +all (which authorizes the entire internet to send as your domain), and having multiple SPF records on the same domain (only one is permitted). These misconfigurations silently destroy deliverability. Prospect AI's email infrastructure management helps teams maintain proper authentication by monitoring SPF, DKIM, and DMARC configurations as part of its sender reputation management, alerting users to misconfigurations before they impact campaign deliverability.

Key Takeaways

1
SPF records specify which mail servers are authorized to send email for your domain via DNS TXT entries
2
Receiving servers check SPF to verify sender legitimacy, directly impacting inbox placement
3
The 10 DNS lookup limit is the most common SPF misconfiguration and causes silent authentication failures
4
Proper SPF configuration is essential for B2B outbound deliverability alongside DKIM and DMARC

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