Validate your SPF DNS record instantly. Check for syntax errors, DNS lookup limits, and common misconfigurations that can hurt your email deliverability.
Sender Policy Framework (SPF) is an email authentication protocol that allows domain owners to specify which mail servers are authorized to send email on behalf of their domain. It works by publishing a specially formatted TXT record in DNS that lists approved sending sources.
When a receiving mail server gets a message, it extracts the domain from the envelope sender address and looks up the SPF record in DNS. It then checks whether the connecting server's IP address is listed as an authorized sender. Based on the result, the server can accept, reject, or flag the message.
SPF records use mechanisms like ip4:, ip6:, include:, a, and mx to define authorized senders. The record must end with an all mechanism that specifies what to do with mail from unlisted senders.
A properly configured SPF record is critical for email deliverability. Together with DKIM and DMARC, SPF forms the core of modern email authentication and helps protect your domain from being used in phishing and spoofing attacks.
Monitor your SPF, DKIM, and DMARC records continuously. Get alerted the moment something breaks so you can fix it before deliverability suffers.
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