The email verifier that cleans your list before you send
Verify email addresses in bulk or one at a time. Reduce bounce rates, improve deliverability, and protect your sender reputation — before every campaign.
The email verification tool built for serious senders
Bulk email list verification — up to 1 million addresses
Upload a CSV, XLS, or XLSX file up to 100 MB. The system auto-detects your email column and processes everything in the background — no need to stay on the page.
- CSV, XLS, XLSX up to 100 MB
- Auto-detects email column — no setup
- All original columns preserved on export
- Duplicate detection within and across files
Check if email exists — one at a time
Use Quick Verify to paste up to 50 email addresses directly — no file upload needed. Ideal for validating contacts before adding them to a campaign or your CRM.
- No file needed — paste directly
- Up to 50 addresses per submission
- Results with Delivery Score in seconds
See how email list cleaning works across use cases
Pre-campaign email list scrubbing
Upload your list before every send and remove invalid, risky, and disposable addresses. Keep bounce rates below 2% and protect your sender reputation. Stay off ISP blocklists before your campaign even launches.
Improving email deliverability
High bounce rates quietly damage your sender score with every campaign you send. Regular email list cleaning keeps your reputation healthy and your emails landing in the inbox. Better hygiene means better deliverability — every time.
Bulk email bounce checker
Identify every address in your database that's likely to bounce — before you hit send. Export the invalid-only results as a suppression file for any sending platform. Stop bounces at the source, not after the damage is done.
Email verifier API integration
Connect the email verifier API to your sign-up forms, CRM, or data pipeline directly. Verify addresses programmatically and reject invalid emails at the point of entry. Keep your list clean from the moment contacts are added.
What sets Mailercloud Email Verifier apart
Live SMTP verification — not just DNS lookups
Most tools check DNS records and call it done. Mailercloud communicates directly with the recipient's mail server via SMTP to confirm the mailbox actually exists — giving you the most accurate results available.
Delivery Score 0—100 for every address
Go beyond pass/fail. Every email gets a numerical Delivery Score so you can set your own threshold — send to 80+ addresses, flag 40—79 for review, and exclude everything below 40. Giving you full control over your list quality.
Simple, credit-based pricing
Starting from $5 for 1,000 credits. Use across bulk uploads, Quick Verify, and API — all from the same credit pool.
- Subscription credits renew each billing cycle
- Yearly plan saves you 20% vs monthly
- API access included in all plans
- Scale up or down anytime
The most affordable email verification pricing
Cheaper than ZeroBounce, NeverBounce, Clearout, and Bouncer at every single credit tier.
| Credits | Mailercloud↓ | ZeroBounce | NeverBounce | Clearout | DeBounce | Bouncer |
|---|---|---|---|---|---|---|
| 1,000 | $5 | — | $8 | — | — | $7 |
| 2,000 | $9 | $16 | $16 | $21 | — | $14 |
| 5,000 | $19 | $39 | $40 | $28 | $10 | $30 |
| 10,000 | $29 | $65 | $50 | $58 | $15 | $50 |
| 50,000 | $79 | $190 | $175 | $175 | $50 | $200 |
| 100,000 | $129 | $350 | $300 | $280 | $90 | $300 |
| 500,000 | $449 | $1,000 | — | $900 | $300 | $1,000 |
Common questions answered
Everything you need to know about Email verify tool.
How accurate is Mailercloud's email verifier?
Mailercloud's email address verifier checks each address against live mail servers via SMTP — not just DNS lookups. Deliverable results are highly reliable. Catch-all domains may show as Risky because their servers accept all addresses without confirming individual mailboxes exist.
Does email verification send an email to the address?
No. Mailercloud communicates with the recipient's mail server to check whether the mailbox exists, but no email is ever delivered to the address. Your contacts will never know they were verified.
How long does bulk email verification take?
Lists under 1,000 emails typically complete within minutes. Larger files take longer as each address requires a real-time check against live mail servers.
Do email verification credits expire?
One-time purchase credits never expire — buy once and use whenever you need. Subscription credits (monthly or yearly plans) renew each billing cycle.
What file formats does the email list cleaner support?
Mailercloud's email list cleaner supports CSV, TXT, XLS, XLSX, and XLSM files up to 100 MB. CSV and TXT files support up to 1,000,000 addresses per file.
Can I use the email verifier API to verify emails programmatically?
Yes. Create an API key from your Mailercloud dashboard and submit up to 50 email addresses per request.
What is the difference between Deliverable, Invalid, and Risky emails?
Deliverable emails are safe to send — the mailbox exists and the server is reachable. Invalid emails include non-existent mailboxes, dead servers, syntax errors, and detected typos — remove these immediately. Risky emails include catch-all domains, disposable inboxes, role-based addresses (info@, admin@), and potential spam traps — review these carefully before sending.
Your next campaign deserves a clean, verified list
Better email hygiene means better deliverability. Start verifying today — straightforward pricing, credits that never expire.