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?
Don't know it? Send a blank email from the domain you're checking to the address below, and we'll read the selector off the DKIM signature it arrives with.
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.