Email authentication, demystified

Your emails are landing in spam. Here's why, and 3 lines of code to fix it.

Enter a domain and see exactly which authentication checks it passes, fails, or leaves ambiguous, in plain English, not raw DNS output.

Email Domain Checker

Enter a domain to check its SPF, DKIM, and DMARC records.

Know your DKIM selector?

Send a blank email from your business's email address (the one that ends in @ your domain) — for example, if you're checking acc.com, send it from hello@acc.com.

Generating address…

Every check pulls live DNS records, with no cached guesses and no stale data.

We explain why something failed, not just that it did.

Some checks, like DKIM, can't be fully verified from outside, so we say so instead of guessing.