Accurate, fast and secure email verification service
We help you find valid emails and connect with customers. Our 99.6% accurate real-time email validation and deliverability tools boost your inbox placement and open rates.
Live email validator
Check an email address in real time
We run syntax checks, suppression checks, disposable detection, MX lookup, and an optional SMTP probe against the mailbox — the same pipeline we use before sending from Cllavio.
Create a workspace for bulk list cleaning
Try a valid mailbox (like your work email) and then an obviously fake one (for example nope+invalid@yourdomain.com) to see how the email validation status and SMTP rejection behave.
Clean your email lists before you hit send
Every bad email address you send to increases your bounce rate and puts more pressure on your sending domain. A few here and there might not sound like much, but at scale they're exactly what inbox providers use to decide whether your next campaign lands in the inbox, the Promotions tab, or spam.
With Cllavio, you can run free real-time checks on single addresses and then upgrade to bulk list cleaning when you're ready. The same pipeline that powers this live validator is used behind the scenes for campaign sending and transactional email: syntax checks, suppression list checks, disposable detection, MX records, and an optional SMTP probe.
Use this tool to verify new signups, leads from forms, CRM exports, or addresses collected in-store. Clean lists mean fewer bounces, fewer spam complaints, and more consistent inbox placement over time.
When to run email validation
- Before importing an old list from another provider (Mailchimp, SendGrid, etc.).
- When you collect leads from events, partners, or scraped sources you don't fully trust.
- As a guardrail on your signup form to block obvious typos and throwaway inboxes.
- Before ramping up volume on a new sending domain or IP.
Bulk list cleaning with Cllavio
Create a free workspace to upload CSVs, validate in bulk, and sync safe contacts back into your segments. Start with up to 15k free validations on the starter tier.
Get started – free up to 15k validations