Email verification: verify every address before you send — catch-alls included.
Real-time MX and SMTP checks clean your whole list, separate the risky catch-alls, and protect your sender reputation — at 3x lower cost than the big verifiers.
- Valid syntax
- Not disposable
- Not a catch-all
- Business domain
Verify an address right now.
No login — runs in your browser.
Email verifier
Check any address — instantly, in your browser.
Upload a list. Get a clean, send-safe one back.
Single address or a million rows — same checks.
Upload or paste
A single email, a CSV, or a whole list — however you have it.
Real-time checks
Live syntax, MX and SMTP checks run on every address.
Catch-all detection
Risky catch-all domains are flagged and separated.
Clean & segment
Valid, risky and invalid are split so you only send to safe ones.
Export or sync
Download the cleaned list or push it to your sender.
Protect your domain. Cut your bounce rate.
Deliverability checks that don’t cost a fortune.
Real-time MX + SMTP
Live inbox checks, not a stale lookup table.
Catch-all detection
Separates safe-to-send catch-alls from the risky ones.
Lower bounce rate
Strip invalids before they ever hit your sequences.
Protect sender reputation
Keep bounces low so your inbox placement stays high.
Bulk verification
Clean entire lists in one pass, at speed.
3x more affordable
A fraction of the cost of the big verification tools.
Verification that actually protects your domain.
Questions, answered.
Live syntax, MX and SMTP checks confirm the mailbox actually exists — not just a static lookup.
Yes — catch-alls are flagged and separated so you can decide whether to send.
Yes — upload a whole list and get a cleaned, segmented file back.
Yes — try the free single-email verifier on our Free Tools page first.
Yes — upload any list, scraped, purchased or exported, and Coldcast runs live MX and SMTP checks on every address, flags catch-alls, and returns a clean, segmented, send-safe file.
Clean your list before you send.
Real-time, catch-all-aware verification that protects your sender reputation.