Free Email Deliverability Checker
Enter your domain and we'll check the DNS records that decide whether your email reaches the inbox or the spam folder - SPF, DKIM, DMARC, and MX.
What SPF, DKIM, and DMARC actually do
These three DNS records are how receiving mail servers decide whether your email is genuine. SPF lists which servers may send mail for your domain. DKIM adds a cryptographic signature proving the message was not altered and really came from you. DMARC ties the two together and tells receivers what to do when a message fails - monitor it, send it to spam, or reject it outright. Gmail and Yahoo now require authentication for bulk senders, so missing records increasingly mean missing inboxes.
How this checker works
Enter your domain and the tool queries your live DNS records through Google's public DNS API - directly from your browser, so we never see or store your domain. It checks your MX records (can you receive mail), your SPF record (including common mistakes like multiple records or a missing "all" mechanism), DKIM keys at the selectors used by Google, Microsoft, and major email services, and your DMARC policy. You get a letter grade and a plain-English explanation of anything that needs fixing.
Frequently Asked Questions
The most common reason is missing or broken authentication: no SPF record, no DKIM signature, or no DMARC policy. Inbox providers cannot verify the mail is really from you, so they err on the side of the spam folder. Content, sending volume, and list quality matter too, but authentication is the foundation.
DMARC tells receivers what to do with mail that fails SPF/DKIM checks. Start with p=none (monitor only), watch the reports for 2-4 weeks to confirm your legitimate mail passes, then move to p=quarantine and eventually p=reject for full spoofing protection.
Yes. Since 2024, Gmail and Yahoo require DMARC for anyone sending bulk email, and they weigh it for everyday senders too. It also stops criminals from spoofing your domain in phishing emails to your own customers - a brand-damage risk that has nothing to do with volume.
A selector is the name under which your DKIM public key is published in DNS (selector._domainkey.yourdomain.com). Your email provider assigns it - Google uses "google", Microsoft uses "selector1/selector2". This tool probes the most common selectors automatically; if yours is custom, check your provider's DNS setup guide.
Yes. The lookups run in your browser against Google's public DNS API - the same records any mail server already sees. Nothing is sent to or stored on our servers.
Emails Landing in Spam?
We set up authenticated, deliverable email for businesses every week - DNS records, warm-up, and the email marketing to go with it.