Email Deliverability Test and Checker
Enter a domain to test its email deliverability setup. The A-F grade covers your SPF, DMARC and MX records, and the test looks for a DKIM key at common selectors. It reads DNS only, so it does not check blocklists or where a campaign lands.
To see where a real campaign lands, use inbox placement testing with a seed list. For BIMI, MTA-STS and TLS-RPT, use the domain security scanner.
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What's Actually Blocking Your Emails
Is your SPF record letting spam through?
SPF tells inbox providers which servers are authorized to send email for your domain. A missing or too-permissive SPF record causes 15–30% of legitimate emails to be filtered. Most brands set it up once and forget it — then add a new ESP and break it.
Why Gmail targets your emails without DKIM
DKIM cryptographically signs every email from your domain. Without it, Gmail and Yahoo treat your emails as unsigned — and unsigned emails receive no trust credit. DKIM failure is the leading cause of B2B and eCommerce emails landing in the Promotions tab.
Who's sending email as your domain right now?
DMARC answers that question. It tells inbox providers what to do when an email fails SPF or DKIM — and gives you daily reports of every IP sending mail as your domain. Brands without DMARC are the easiest targets for phishing attacks that erode sender reputation.
A single blacklist listing can block thousands of emails instantly
When your domain or sending IP appears on Spamhaus, Barracuda, or SORBS, inbox providers reject or filter your mail at the gateway — before recipients ever see it. Listings can appear within hours of a complaint spike. This test reads DNS records only, so check blocklist status separately.
Fix What You Found
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Why We Built This Tool
InboxEagle monitors authentication records for 2,000+ brands. The most common issue we see: a team adds a new ESP to their stack, the SPF record hits the 10-lookup limit, and inbox rates drop weeks later without anyone connecting the cause. This free check shows you the current state on demand, so you can catch it before it costs you.
What Goes Wrong Without This
Without SPF, DKIM, and DMARC alignment, ISPs can't cryptographically verify you're authorized to send email as your domain. Gmail and Yahoo both treat unauthenticated emails with zero trust — they skip the inbox entirely. A single blacklist listing can block thousands of emails at the gateway before recipients ever see them.
Who This Tool Is For
E-commerce & DTC Brands
Shopify and Klaviyo senders sending 50K–5M emails/month who add new ESPs and break SPF records without realizing it.
Email Marketing Agencies
Teams managing 5–50 client domains who need fast per-client audits without logging into each ESP separately.
B2B SaaS & Outbound Teams
Sales and marketing teams running sequences in HubSpot or Outreach where one broken authentication record stalls all cadences.
Frequently Asked Questions
What does the Email Deliverability Checker test?
How often should I check my domain?
What does a 'D' or 'F' grade mean?
How do I run an email deliverability check?
Why does the checker say no DKIM key was found?
Is this email delivery testing the same as seed list testing?
Do I need an InboxEagle account to use this tool?
Daily Deliverability Changes. Your Check Doesn't.
This report is a free one-off snapshot. InboxEagle checks your SPF, DKIM, MX and DMARC policy records every 24 hours and alerts you on any change, tracks blocklist status, and records inbox placement at Gmail, Yahoo, AOL and Outlook from its seed mailboxes. 2,000+ brands use it to maintain a 97.3% average inbox rate on 248M emails per month.
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