What is SPF?
SPF (Sender Policy Framework) is a DNS record that specifies which mail servers are authorized to send email on behalf of your domain. When a receiving server gets your message, it checks the sending server against your SPF record to help verify the mail is legitimate — a core defense against spoofing and a key factor in deliverability.
How does SPF work?
You publish a TXT record in DNS listing approved senders. Receiving servers compare the message’s sending IP against that list and pass or fail SPF accordingly. SPF works best alongside DKIM and DMARC. Check your record with the deliverability checker.
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DKIM (DomainKeys Identified Mail)
DKIM (DomainKeys Identified Mail) is an email-authentication method that adds a cryptographic signature to every message…
DMARC
DMARC (Domain-based Message Authentication, Reporting & Conformance) is a DNS policy that builds on SPF and DKIM. It tel…
Email Deliverability
Email deliverability is the measure of whether your emails actually reach recipients’ primary inboxes rather than the sp…
Inbox Warmup
Inbox warmup is the process of gradually building a new email account’s or domain’s sending reputation before running ou…
Questions
SPF — FAQ
Is SPF enough on its own?
No. SPF is necessary but not sufficient — you also need DKIM and DMARC for full authentication and the best deliverability.
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