Confirm email addresses instantly. Our email checker tests one email or a full list in real time, so you catch bad addresses before they bounce and land in real inboxes.
Active and deliverable
Sample results. Checks never send an email.
Accuracy on every check
Clear statuses to act on
Start with no credit card
Verifies 1 email
Clean your data first and every campaign performs better. Verify emails accurately, quickly, and at scale with Email Verifier.
Cut hard bounces and dodge spam traps by verifying every email before outreach.
Stop paying to send to dead addresses. Put your budget only on emails that can be delivered.
Protect your data with privacy-first, secure, and responsible verification practices.
Get up to 99.8% accuracy from SMTP-level checks with multiple retry attempts.
Upload a CSV and verify thousands of emails in minutes.
Verify single emails instantly and push bulk lists through at high throughput.
Our email checker handles it from upload to clean results.
Upload a CSV or enter a single address straight from your CRM, spreadsheets, or marketing tools.
Run SMTP-level checks on every address and get each one classified accurately.
Export your verified list with clear status labels, then filter it and send right away.
Validate every address with SMTP-level checks, including the RCPT TO command, without sending a single email. This goes beyond basic email validation to confirm the mailbox itself can receive mail, and Email Verifier retries each check multiple times before it assigns a final status, so you act on results you can trust.
Checks every layer, including the address format, the domain, and whether the mailbox itself can receive mail, before giving you a Valid, Invalid or Risky result.
Simply the tool you use to run that check, for one address or a whole list, showing a clear result for every email so you know which ones are safe to send.
The narrower piece inside it, confirming the format is correct (such as the @ sign and domain spelling), without checking whether the mailbox exists.
ReachStream's email verifier runs all six checks, so you get a clear answer, not just a format check.
Get one of five clear statuses for every email, plus the next step to take.
Active and deliverable. Send with confidence.
Safe to sendThe mailbox does not exist. Drop it from your list.
Remove before sendingThe domain accepts all emails, so delivery to this address isn't guaranteed. Resolve it before you send.
Flag for reviewResolveMailbox behavior is inconsistent, so deliverability is uncertain. Resolve it before you send.
Flag for reviewResolveHigh-risk or a potential spam trap. Keep it out of every send.
Remove before sendingStop guessing on Catch-All and Risky emails. Resolve them.
Run a deeper verification on every Catch-All and Risky result, see which addresses are likely deliverable, and send with confidence instead of deleting real leads.
See and manage every verification run in one place.
Pick the verification method that fits your workflow.
Check any address before outreach. Enter an email and get a verification result in seconds.
Upload a CSV, verify thousands of addresses, review the results, and download a clean list ready to send.
Automate verification across your products, forms, and workflows.
POST /api/v1/api-email-verifier/request/X-API-Key: <your-api-key>Content-Type: application/json { "request_type": "verifier", "request_origin": "signup-form", "request_body": [ /* emails to verify */ ]}// 201 Created{ "history": { "id": 10482, "status": "pending" } }GET /api/v1/api-email-verifier/request/10482{ "details": { "progress": 100, "results": [ … ] } }Illustrative example. See the API documentation for full request and response schemas. API access is included starting on the Pro plan.
Verify email addresses without leaving Claude. Connect the ReachStream EmailVerifier connector, use your own account and credits, and get results from the same API that powers your dashboard. No switching between tools.
https://emailverifier-mcp.reachstream.com/mcpclaude mcp add --transport http "ReachStream EmailVerifier" https://emailverifier-mcp.reachstream.com/mcpIn Claude Desktop, open Settings, go to Connectors, add the server URL, and click Authenticate.
Here are your results:
3 credits used from your ReachStream account
Run enterprise campaigns, close new business, or build systems for clients. Start every send with verified data.
Keep CRM and campaign data clean across every team.
Verify prospect emails before outreach and reach real buyers.
Clean every list before you send and protect sender reputation.
Verify only what you need and pay with simple credits.
Deliver clean, verified lists for every client campaign.
Verify emails inside Claude with the MCP connector.
Build email verification into client systems with the API.
Protect your business data with a verifier that holds rigorous security certifications and meets major global data protection standards.
Visit the Trust CenterService organization controls
EU data protection
Information security management
California consumer privacy
Canadian privacy law
Integrated 2025 rules
Pick monthly or annual billing on Starter, Growth, and Pro.
ReachStream Email Verifier is a real-time email verification tool that tells you whether an email address is valid, active, and safe to send to before you reach out. Use it to verify a single email, clean a full list in bulk, or automate checks with the Email Verification API. It runs SMTP-level validation to cut bounce rates, protect your sender reputation, and improve email deliverability.
Email verification checks an address in layers before you send to it. ReachStream Email Verifier runs six checks on every email: syntax, domain, MX records, an SMTP handshake (RCPT TO), mailbox response, and risk analysis for catch-all and spam trap signals. It retries the checks multiple times, then assigns one of five statuses so you know exactly what to do with each address.
Verify email addresses before sending to stop hard bounces, avoid spam traps, and protect your sender reputation. Invalid and risky addresses push up bounce rates, which sends your emails toward spam folders and wastes sending budget. Verify first, and every campaign goes only to addresses that can actually receive it.
ReachStream Email Verifier delivers up to 99.8% accuracy. It gets there by combining AI-powered validation, SMTP-level checks with multiple retry attempts, and ongoing quality review processes.
No. ReachStream Email Verifier never sends an email to the address it checks. It uses the SMTP RCPT TO command to ask the receiving mail server whether the mailbox exists, then closes the connection before any message is delivered. The contact never sees the check.
Use single email verification to check one address in real time before individual outreach. It costs 1 credit and returns a result in seconds. Use bulk email verification to upload a CSV, verify thousands of addresses at once, and download a status-labeled file ready to filter and send.
Yes. Use the Email Verification API to automate verification in signup forms, SaaS platforms, CRMs, and internal systems. It supports secure API key authentication and asynchronous bulk verification, and it's built for high-volume use. API access is included starting on the Pro plan. Check the API documentation for full request and response schemas.
ReachStream Email Verifier uses credit-based pricing: 1 credit verifies 1 email. Start with a 30-day Free Trial that includes 100 credits and needs no credit card. Then choose a Starter, Growth, or Pro plan on a monthly or annual subscription, or get a custom-volume Enterprise plan. Compare Email Verifier plans.
Yes. ReachStream Email Verifier is ISO 27001:2022 and SOC 2 Type II certified, and compliant with GDPR, CCPA, PIPEDA, and DPDPA 2023. Review every certification and policy in the Trust Center.
Paste the address into an email checker. It confirms the format is right, the domain exists and accepts mail (MX records), and the mailbox is reachable with an SMTP check, all without sending a message. ReachStream then labels the result Valid, Invalid, Catch-all, Risky or Do Not Mail.
Enter it in the email checker above. In seconds you will see if the address is valid, invalid, risky or a catch-all, so you know whether it is safe to send to. A single check does not send any email to the address.
Email validation checks the format of an address, such as the @ sign and domain spelling. Email verification goes further and confirms the mailbox exists and can receive mail. An email checker or verifier does both, so you get a clear send or do-not-send answer.
Yes. You can check single emails for free. A 30-day free trial adds 100 credits to verify a list, and no credit card is needed. Paid plans cover larger lists.
Yes. Upload a CSV file and the bulk email verifier checks the whole list in one run, up to 25,000 emails. Download the clean results when it finishes. See our bulk email verifier page for details.
Email lists go stale as people change jobs and domains close. As a general rule, verify a list before every large campaign, and again if it is more than a few months old. This is general guidance, not a ReachStream guarantee.
Book a demo and see Email Verifier verify your own list.
Check an email address in seconds and see whether it's safe to send. Build every campaign on clean data, starting today.
Create a free account to keep verifying. Your 30-day Free Trial includes 100 credits and needs no credit card.
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