Send with certainty.
Verify every address before it costs you deliverability.
- Cleaner, more accurate data
- Stronger email marketing ROI
- Sign-up forms protected from junk
- A sender reputation that stays intact
100 free credits. No card required.
Works with major email marketing tools.
Answers in seconds.
One address, one verdict, while the form is still open.
Instant checks · SMTP verdict in ~2s.
Clean lists, fast.
Upload a CSV, watch it resolve live, download the addresses worth keeping.
Trusted by experts. Loved by customers.
Catch-all, handled honestly.
Some domains accept every address. We tell you — instead of guessing.
The mailbox exists and accepts mail — safe to send.
May bounce or land in spam — the address can't be fully confirmed as safe.
The address doesn't exist or was refused — it will bounce.
The mail server gave no clear answer — worth trying again later.
Filter the junk.
Disposable inboxes, role addresses and obvious typos — flagged before they hurt.
Mailbox providers throttle senders whose campaigns bounce. Removing undeliverable addresses before you send keeps your domain under their thresholds.
An API you'll like.
REST, API keys with scopes, per-key rate limits, JSON that makes sense.
Check one, free.
No account needed. Five checks per hour, on the house.
The free check catches typos, fake domains, and throwaway addresses. To confirm the inbox really exists and won't bounce, run the full check.
Built for builders.
One POST, one verdict — in whatever language you already write.
# Verify a single addresscurl -X POST https://app.qualisend.com/api/v1/verify \-H "Authorization: Bearer qs_live_..." \-H "Content-Type: application/json" \-d '{"email":"jane@example.com"}'
{"email": "jane@example.com","status": "deliverable","reason": "accepted_email","score": 98,"sub_flags": { "free_mail": false, "role": false },"did_you_mean": null}
Pay for results.
One credit verifies one address. Start free, scale when your lists do.
- Single + bulk verification
- Full status + reason detail
- Credits never expire
- 20% off every credit
- Credits refresh each month
- Unlimited team seats
- Cancel anytime
What's new.
Every verified address now expands into domain, account, and verdict detail — MX record, provider, catch-all state and more.
Why some domains accept every address, why no verifier can confirm those mailboxes, and how to send to them anyway.
An honest look at how the two services differ — features, statuses, and who each fits best.
Your reputation, protected.
Clean your first list in minutes. 100 free credits, no card required.
Get started