Launching today
MailSenpai DNS Check
Free SPF, DKIM, DMARC and MX checker that tells you the fix
1 follower
Free SPF, DKIM, DMARC and MX checker that tells you the fix
1 follower
Check any domain's SPF, DKIM, DMARC and MX records in seconds and get plain-English fixes with the exact values to publish. Plus SPF and DMARC generators, an email header analyzer, an embeddable widget, a free JSON API and an MCP tool for AI assistants.
Launch Team
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Hi Product Hunt 👋
We are the team behind MailSenpai, the email marketing platform, and SMTP Senpai, our separate transactional email service, with servers in the EU.
MailSenpai DNS Check reads public SPF, DKIM, DMARC and MX records and explains what to fix, including record values you can publish. DNS authentication is one part of email delivery; the sending history and each recipient provider’s filters also matter.
The free tools now include:
• SPF and DMARC record generators
• An email header analyzer that runs in your browser
• An embeddable DNS checker for agency sites and technical guides
• Free JSON DNS and blacklist APIs, without an API key
• Blacklist checks and monitoring, with email alerts when results change
• A real-message spam test with a 0–10 score and explained checks; the score does not guarantee inbox placement
DNS checks need no account. Monitoring and the spam test use a company email address. The MailSenpai MCP server also exposes DNS, blacklist and spam diagnostics to compatible AI assistants; the connector uses a MailSenpai account with AI access.
You can find the tools at https://en.mailsenpai.com/free-tools/
What would help you most when diagnosing email problems? We would welcome feedback from developers, agencies and people who manage email for clients.