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.
See deliverability tools
Want to see SPF working in practice?
Keres AI uses this in every call — see how it works for your specific vertical and workflow.
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…
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.
See SPF working live
Book a free 30-minute demo and watch Keres answer a call, qualify the lead, and book an appointment in under sixty seconds.
Get authentication set up for you