What are SPF, DKIM, and DMARC?

They are DNS-based email authentication standards: SPF lists the servers allowed to send for your domain, DKIM signs messages with a public key published in DNS, and DMARC tells receivers what to do when SPF or DKIM fails.

Which should I set up first — SPF, DKIM, or DMARC?

Set up SPF and DKIM first, since DMARC builds on them. Then publish a DMARC record starting with p=none to monitor, and tighten it to quarantine or reject once the reports look clean.

Are these email tools free?

Yes, all email authentication checkers are free with no signup required.

Email tools

Check the DNS records that decide whether your email reaches the inbox. Look up and validate SPF, DKIM, and DMARC for any domain, and catch misconfigurations before they hurt your deliverability.

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Frequently asked questions

What are SPF, DKIM, and DMARC?: They are DNS-based email authentication standards: SPF lists the servers allowed to send for your domain, DKIM signs messages with a public key published in DNS, and DMARC tells receivers what to do when SPF or DKIM fails.
Which should I set up first — SPF, DKIM, or DMARC?: Set up SPF and DKIM first, since DMARC builds on them. Then publish a DMARC record starting with p=none to monitor, and tighten it to quarantine or reject once the reports look clean.
Are these email tools free?: Yes, all email authentication checkers are free with no signup required.

Operated by

Turnint AI Tools is a suite of free tools built and operated by unbounded pioneering inc, the company behind the Turnint AI agent platform.

Ryosuke SuzukiFounder & CEO

Founder & CEO of Unbounded Pioneering Inc., the company behind the Turnint AI agent platform, and an expert in machine learning and AI product development. He began his career in machine learning research at a university laboratory, then designed and built large-scale products as a software engineer at PLAID, Rakuten, and Recruit, while also driving new business development. Now specializing in generative AI and AI agents, he works across both engineering and business development, and is a named inventor on multiple granted patents in web technology.

Named inventor on granted patents JP6887648 & JP7480958 · Patent pending on Turnint AI technology

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