Email Authentication Checker (SPF, DKIM, DMARC)
Enter a domain to check its email authentication configuration. The tool validates SPF records (who can send on your behalf), DKIM records (email signatures), and DMARC policies (what to do with unauthenticated mail). Misconfigured authentication is the top reason emails land in spam.
What this tool checks
- SPF record lookup and validation
- DKIM selector detection and verification
- DMARC policy analysis
- Actionable recommendations for each protocol
Automate this with the API
Run this tool programmatically from your code. Get a free temporary API key with 200 requests — or register for unlimited access.
curl https://apixies.io/api/v1/email-auth?domain=... \
-H "X-API-Key: YOUR_API_KEY"
Frequently asked questions
Why do SPF, DKIM, and DMARC matter?
They prevent email spoofing. Without them, anyone can send emails pretending to be your domain. Most major email providers (Gmail, Outlook) now require all three for reliable inbox delivery.
My SPF record is valid but emails still go to spam. Why?
SPF alone isn't enough. You need DKIM for message signing and a DMARC policy to tie them together. Also check that your sending IP has a good reputation and your content isn't triggering spam filters.
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