The complete email verification platform for businesses that need accuracy and scale. Verify individual emails, process bulk lists, use flexible API access, and automate list hygiene with ease.
No signup required
5 free checks left today
Example result
john@primeverifier.com
GoogleExample result
john@primeverifier.com
GoogleWorks with your favourite tools
Why teams choose Prime Verifier
Boost Deliverability
Higher inbox placement
Eliminate Bounces
Protect sender score
Block Disposables
268,000+ domains detected
GDPR Compliant
Logs deleted after 90 days
Fast Verification
Low-latency processing
Real Catch-All Checks
Probed, not guessed
Pay Per Result
Unknown emails are free
Risk Scoring
0-100, rule-based
From individual lookups to bulk lists of millions, one platform, complete confidence. Every feature built around the results you care about.
Confirm that an email address can actually receive messages, not just that it looks valid. Catch bad addresses before they damage your campaigns.
Block throwaway and temporary email addresses from entering your list. Updated daily from 277,000+ known disposable domains.
Every email gets a 0-100 score from its result plus the signals around it: catch-all, role address, free provider, likely typo, security gateway. Filter your list on one number.
Upload your CSV or TXT file, from a few hundred to millions of emails. Download a clean, verified list with quality grades and risk scores.
Thirteen connectors including Mailchimp, HubSpot, Klaviyo, Zoho CRM and Google Sheets. Or use the REST API and webhooks to fit verification into any workflow.
Two-factor sign-in, API keys you can revoke at any time, IP allowlisting for API access, GDPR-aligned processing, and verification logs deleted automatically after 90 days.
No complex setup. No infrastructure to manage. Just accurate results , for any team, any scale.
Paste a single address, upload a CSV list, or connect via our developer API. Works for one email or ten million, your choice.
Every address goes through layered validation, syntax, domain health, mailbox existence, catch-all detection, and risk analysis.
Get your verified list instantly with quality grades (Good · Risky · Bad), risk scores, and actionable flags. Ready to send with confidence.
A clean REST API with predictable JSON, idempotent retries, webhooks, and streaming bulk, built to drop into your signup flow, CRM sync, or data pipeline. No mail-server plumbing, no IP reputation to babysit. That's our job.
REST API
One endpoint, JSON in/out. Verify a single address in well under a second.
Idempotency keys
Safely retry any request, the same key replays the exact result, never double-charged.
Webhooks
Get a callback the moment a bulk job finishes or a balance runs low.
Bulk, async
Push lists from a few hundred to millions, processed in the background at scale.
Streaming (SSE)
Stream results live as each address resolves, or pull a partial CSV anytime.
Pay for answers
Only confirmed mailboxes cost a credit. Catch-all, unknown and error are free.
Full guides, quickstarts & the live API reference at primeverifier.com/docs
curl -H "X-API-KEY: your_key" \
"https://api.primeverifier.com/v1/verify/single?email=john@primeverifier.com"Response
{
"status": "success",
"data": {
"email": "john@primeverifier.com",
"result": "ok",
"resultCode": 1,
"subResult": "ok",
"quality": "good",
"free": false,
"role": false,
"disposable": false,
"catchAll": false,
"didYouMean": null,
"provider": "google",
"antiSpam": false,
"riskScore": 5,
"creditsCharged": 1,
"creditsRemaining": 4999,
"executionMs": 218
}
}Numbers that matter, accuracy, speed, and coverage you can rely on.
Throwaway and temporary-inbox domains on the blocklist, refreshed daily
Half of all live mail-server checks finish faster than this. Repeat lookups come straight from cache
Processed to date, about 5.7 million a day over the last 30 days
Real conversations with receiving mail servers, averaged over the last 30 days
Thirteen tools connect directly, from email marketing platforms to CRMs, sending services and Google Sheets. Our Zapier app reaches 9,000+ more. Clean a list where it already lives, with no export and no re-import.
One simple credit. Buy once, or save with a monthly plan, no hidden fees, no monthly minimums.
From $0.00055 per credit at volume
Practical guides on email deliverability, list hygiene, and sending best practices , written by the team that lives this every day.
Most 'best verifier' lists are ranked by affiliate payout. This one compares eight services on price at volume, what each one charges for and credit expiry, from each vendor's own pricing page.
ZeroBounce does a lot, and charges for it. Seven alternatives with prices from their own pricing pages, what each one charges for, and who each one suits.
Catch-all domains accept any address, real or fake, which breaks the usual yes-or-no check. Here is what a verifier can honestly tell you about them, and how to send to catch-all addresses safely.
The questions people ask most about verifying email addresses.
Email verification checks whether an address can actually receive mail before you send to it. Prime Verifier runs four checks in under a second: syntax, the domain's MX (mail-server) records, a live SMTP check that asks the mail server whether the mailbox exists without ever sending a message, and a catch-all probe for domains that accept everything.
Every address gets a live check against its own mail server, not a guess from syntax or a stale database. Results are most certain on Gmail, Outlook, and Yahoo. The hard cases are catch-all domains, which we actively probe rather than guess, and when a mailbox genuinely cannot be confirmed we say so instead of labelling it valid, and that result is free.
A catch-all domain accepts mail to any address, even ones that do not exist, so a single check cannot prove one specific mailbox is real. Prime Verifier probes a real and a fake address in the same session to produce a usable signal, instead of just labelling the whole domain risky.
No. The check is silent. We talk to the receiving mail server the way a sending server would, up to the point of asking whether the mailbox exists, then stop before any message is delivered. The person being checked never receives an email.
Yes. You can verify an address on the site with no account, and signing up gives you 100 free verifications with no credit card. After that you buy a single credit type, pay once as you go or save with a monthly plan, and credits never expire.
Both. Upload a CSV or Excel file to clean an entire list (we remove duplicates and hand back a graded file), or call the REST API to verify addresses in real time at signup, checkout, or inside your data pipeline.
Verify any email, clean your list, and protect your sender reputation. Free to start, no credit card, no commitment.