Free tools for better email.

Check your domain, find blocklist listings and preview your emails before you send. No sign-up, and nothing you type is kept.

Domain Health CheckSPF, DKIM, DMARC, MX and reverse DNS for any domain — with the record to add when one is wrong.Open the tool →

Blocklist CheckerIs an IP address or domain on Spamhaus, SpamCop, Barracuda or six other public blocklists?Open the tool →

Email PreviewPaste your email’s HTML and see it on desktop, mobile and in dark mode — plus a pre-send checklist.Open the tool →

Private by design

The domain and blocklist checks only read public DNS records — the same ones every mail server reads. Email Preview never uploads your HTML: it stays in your browser.

Want these checks on every campaign?

Devlo runs them before each send, paces delivery like a person and shows you what landed.

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Ready togrow smarter?

Bring your list, we'll bring the deliverability. Set up takes an afternoon, and the Free plan stays free.

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