About

About Spamcheck

A technically-honest email deliverability checker, built by a developer — not a copywriter.

In 2024 Gmail and Yahoo started enforcing bulk-sender rules: valid SPF, DKIM, and a DMARC policy are no longer optional. Most "why is my email in spam" articles are vague. Spamcheck instead runs the real DNS checks and tells you exactly what's wrong and how to fix it.

How the checks work

• Lookups run entirely in your browser using DNS-over-HTTPS (Google & Cloudflare). Nothing is sent to our servers.
• SPF, DKIM, and DMARC records are parsed against the rules receivers actually enforce.
• The DMARC generator builds a valid record you can paste into DNS.

See the disclosure page for how the site is funded.