53.21% of domains publish an SPF record — but publishing it incorrectly, or not at all, means your legitimate business emails are treated as suspicious by the servers that receive them.
What SPF does
SPF is a DNS record that lists every service authorised to send email on behalf of your domain. When a mail server receives an email claiming to be from you, it checks your SPF record. If the sending server isn't listed, the email fails.
Without SPF, there's no list to check. Your legitimate emails carry no authentication signal, and criminal impersonation emails carry the same signal as yours: none.
What happens without it
- Invoices, proposals, and follow-ups get junked or rejected by recipient mail servers
- Without SPF, you cannot implement DMARC enforcement — the door to full spoofing protection stays open
- Enterprise buyers' email security systems treat unauthenticated senders as higher risk
- Google and Yahoo's 2024+ sender requirements list SPF as a baseline — non-compliance affects deliverability
What fixing it involves
SPF is a single DNS TXT record added at your domain registrar. The main risk: SPF has a hard limit of 10 DNS lookups per evaluation. Most businesses use more than 10 sending services (email provider, CRM, newsletter tool, billing system) — each one consuming a lookup. Exceeding the limit makes the entire record invalid and breaks authentication silently.
Getting SPF right means auditing every service that sends on your behalf, structuring the record within the lookup limit, and testing before publishing.
What your domain scores right now
Run the free DomainScores check to see your current SPF grade alongside 34 other security checks — instant, no signup.
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