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SPF (Sender Policy Framework) is a DNS-based email authentication protocol that specifies which mail servers are authorized to send email on behalf of your domain. A correctly configured SPF record prevents spammers from forging your domain in the envelope sender address. Use our free tools, follow our guides, and read our articles to master SPF.
Validate your domain's SPF record, check syntax, count DNS lookups, and identify misconfigurations.
Create a valid SPF TXT record with authorized senders, IP ranges, and include mechanisms.
Understand the three pillars of email authentication and how they work together to protect your domain.
Learn why the 10-lookup limit exists, how to count your lookups, and techniques to flatten your SPF record.
Google and Yahoo now require SPF for all senders. Learn about the latest requirements and how to comply.
A comprehensive guide to implementing SPF, DKIM, and DMARC correctly for maximum deliverability.
Step-by-step walkthrough of generating an SPF record with the right mechanisms and qualifiers.