Free Email Verifier
Check if an email address is real before you send. Detects invalid mailboxes, catch-all domains, and SEG-protected addresses.
How it works
Enter an email address
Any address. Yours, a prospect's, or a list you're about to import.
We run 3-layer verification
Format check, MX record lookup, and mailbox-level deliverability probe.
Get a clear verdict
Deliverable, undeliverable, risky, or unknown, with the reason why.
Why this matters
Sending to invalid email addresses causes bounces. High bounce rates damage your sender reputation and can get you blacklisted. Validating emails before sending protects your deliverability and saves you from wasting outreach on dead addresses.
Unlimited email validation on every plan
Powered by Enrich.so out of the box, or bring your own API key. SendKit supports 10+ major enrichment and validation providers. Validate your entire list on import.
Bulk validation
Validate entire CSV lists on import, thousands at a time
10+ providers
Enrich.so built-in, or bring your own API keys for any provider
Auto-clean on import
Invalid emails are flagged and skipped before your campaign starts
More free deliverability tools
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SPF, DKIM & DMARC Checker
Verify your domain email authentication in one click. See which records pass, which fail, and how to fix them.
Inbox Placement Test
Test if your emails land in primary, promotions, or spam. Works across Gmail, Outlook, and Google Workspace.
Email Spam Checker
Paste your email copy and get a spam score. We scan for trigger words, formatting issues, and patterns that land you in spam.
Email Signature Generator
Create a professional HTML email signature in minutes. Works with Gmail, Outlook, and Apple Mail.
Email Warmup Calculator
Enter your target sending volume and get a day-by-day warmup schedule. Know exactly how many emails to send each day.
Subject Line Tester
Score your email subject line before you send. Get feedback on length, spam risk, and engagement potential.
Email Header Analyzer
Paste raw email headers and see the full routing chain, authentication results, and delivery delays in a readable format.
DNS Lookup Tool
Look up MX, A, CNAME, TXT, and NS records for any domain. See exactly how your domain is configured.
Domain Age Checker
Check how old any domain is. See registration date, expiry date, and registrar info. Domain age matters for email deliverability.
Email Bounce Rate Calculator
Calculate your email bounce rate and compare it against industry benchmarks. See if your list health needs attention.
Email Open Rate Calculator
Calculate your email open rate and benchmark it against industry averages. See how your campaigns compare.
Cold Email Mailbox Calculator
Enter your target replies and meetings. We calculate the exact number of mailboxes, domains, and daily sends you need.
Got questions? We've got answers.
Format and MX record checks are highly accurate. Mailbox-level verification can detect most invalid addresses but some servers do not reveal whether a specific mailbox exists (catch-all domains). Overall accuracy is typically 95%+.
Ready to hit primary?
Set up SendKit's isolated infrastructure and start sending in under 15 minutes.
Dedicated IPs on every plan. Cancel anytime.