Stellar Tools · DNS-over-HTTPS
Email Domain Checker
Check whether your domain email is secure and stays out of spam: MX, SPF (including the 10 DNS lookup limit), DKIM, and DMARC, with how to fix each issue.
Enter a Domain or Email Address
Example: yourstore.com or [email protected]
Ready to Check Your Domain Email
Enter a domain and click Check Email. We check MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, and BIMI through public DNS, without sending any email.
Free
No Login
SPF, DKIM, DMARC
Counts SPF 10 DNS Lookups
FAQ
Frequently Asked Questions
SPF defines which servers may send email for your domain. DKIM adds a digital signature so the message cannot be altered. DMARC tells receivers what to do when mail fails SPF/DKIM (deliver, spam, or reject) and sends you reports.
Common causes: SPF exceeds 10 DNS lookups and errors out, there is more than one SPF record, DKIM is not active, or DMARC is missing. Since 2024 Gmail and Yahoo require SPF, DKIM, and DMARC for bulk senders.
DKIM lives under a selector name that can be anything. We check 40-odd common selectors (Google, Microsoft 365, Zoho, Brevo, Mailchimp, etc.). If yours differs, find s= in the DKIM-Signature header of your email and enter it in the DKIM Selector field.
No. Every check reads public DNS records over DNS-over-HTTPS. No email is sent and nothing connects to your mail server.
Yes, free and without login. Each user is limited to 10 checks per minute.
