Email Verification

Stop sending emails into the void.

Bad emails destroy your sender reputation, drain your budget, and kill deliverability. Verifox runs 9 deep checks on every address — syntax, MX, SMTP, inbox probe, disposable, role, catch-all, blacklist, and AI confidence scoring — so only real, deliverable emails make it to your list.

4 of 4 free verifications remaining today

3 free checks · No signup needed · We never store your emails

Trusted by teams who take deliverability seriously

2.1B+

Emails verified

500K+

Users worldwide

99.2%

Accuracy rate

<1.2s

API response time

MailchimpHubSpotSalesforceSendGridZapierStripe

The hidden cost of bad data

Every bounced email is money you set on fire.

22.71% of email addresses decay every year. That means nearly 1 in 4 contacts on your list right now are dead, fake, or dangerous. Every email you send to them costs you — in credits, in reputation, and in deliverability.

Hard Bounces

Every hard bounce is a red flag to Gmail, Outlook, and Yahoo. Hit 2% and your domain gets throttled. Hit 5% and you are in the spam folder. Permanently.

Damages sender reputation

Spam Traps

ISPs plant honeypot addresses in purchased and scraped lists. Send to one — just one — and your entire sending domain gets blacklisted. No warning. No appeal.

Damages sender reputation

Catch-All Sinkholes

Catch-all servers accept every email, even fake ones. 40% of addresses on catch-all domains are dead. You are paying to send emails that nobody will ever read.

Damages sender reputation

Hard Bounces

Every hard bounce is a red flag to Gmail, Outlook, and Yahoo. Hit 2% and your domain gets throttled. Hit 5% and you are in the spam folder. Permanently.

Damages sender reputation

Spam Traps

ISPs plant honeypot addresses in purchased and scraped lists. Send to one — just one — and your entire sending domain gets blacklisted. No warning. No appeal.

Damages sender reputation

Catch-All Sinkholes

Catch-all servers accept every email, even fake ones. 40% of addresses on catch-all domains are dead. You are paying to send emails that nobody will ever read.

Damages sender reputation

The basics

What is email verification?

Email verification is the process of confirming that an email address is real, active, and safe to send to — before you hit send. It checks whether the address exists, whether the mailbox can receive messages, and whether the address is a known risk like a spam trap, disposable, or role-based address.

Think of it as a background check for every contact on your list. Instead of blindly trusting that john@company.com is real, verification confirms it by talking to the mail server, probing the inbox, and cross-referencing against known threat databases.

The result: a clean list where every address has been vetted. No guesswork. No bounces. No blacklists.

“A background check for every contact on your list.”

Raw Email

↓

9 Checks

↓

ValidInvalidRisky

How Verifox works

Three steps. Zero bounces.

Upload Your List

CSV, Excel, TXT, or paste directly. Drag and drop your file or connect via API. Verifox accepts lists of any size — 100 emails or 10 million.

We Run 9 Checks

Every single email goes through syntax validation, MX lookup, SMTP handshake, inbox probe, disposable detection, role filtering, catch-all resolution, DNS blacklist check, and AI confidence scoring. Simultaneously.

Download Your Clean List

Get your results as a CSV with every email tagged: valid, invalid, risky, or unknown — each with a confidence score. Integrate into your ESP, CRM, or marketing platform with one click.

The Verifox engine

Nine checks. Every single email. Every single time.

Most tools run 3-4 checks and call it done. Verifox runs all nine on every address — including the one that 92% of competitors cannot do.

Syntax Validation

Catches typos, missing @, broken formatting before anything else runs.

MX Record Lookup

Confirms the domain has mail servers configured and accepting connections.

SMTP Handshake

Connects to the mail server and asks: "Does this mailbox exist?"

Inbox Probe

Goes beyond SMTP — tests whether the mailbox can actually receive messages.

Disposable Detection

Flags throwaway addresses from 10,000+ known temporary email providers.

Role Address Filter

Identifies generic addresses like info@, admin@, support@ that rarely convert.

Catch-All ResolutionDIFFERENTIATOR

Our differentiator. AI-powered analysis that resolves catch-all domains where every other tool gives up.

DNS Blacklist Check

Cross-references against 30+ real-time blacklists to flag compromised domains.

AI Confidence Scoring

Machine learning assigns a deliverability confidence score from 0-100 based on behavioral and historical signals.

Our unfair advantage

92% of verification tools fail on catch-all domains. We do not.

Catch-all domains are configured to accept every email address, whether it exists or not. Send to john@catchall.com? Accepted. Send to asdfghjkl@catchall.com? Also accepted.

Every other verification tool hits this wall and gives up. They mark the entire domain as “accept-all” or “unknown” and move on. That means 30-40% of addresses on catch-all domains — addresses that are completely dead — stay on your list.

Verifox built an AI confidence engine specifically for this. Instead of asking the server “does this exist?” we analyze behavioral patterns, historical delivery data, domain reputation, and mailbox activity signals. We score each address individually, even on catch-all domains.

Before Verifox

After Verifox

john@example.comUnknown

john@example.comValid (94%)

jane@example.comUnknown

jane@example.comValid (87%)

asdf@example.comUnknown

asdf@example.comInvalid (12%)

test@example.comUnknown

test@example.comInvalid (8%)

mike@example.comUnknown

mike@example.comRisky (51%)

Verifox resolves catch-all domains with 94.7% accuracy

The math does not lie

How much are bad emails costing you?

Enter your list size and average bounce rate. We will show you exactly what you are losing — and what you would save with clean data.

Your numbers

List sizeCurrent bounce rate (%)Cost per email sent ($)Sends per month

Your current waste

Bounced emails per send2,100

Wasted sends per month8,400

Money wasted per month$100.80

Money wasted per year$1209.60

After Verifox

Bounce rate reduced to0.8%

Emails saved per month6,800

Money saved per year$979.20

ROI on Verifox1,998%

Get These Savings

Results that speak for themselves

From blacklisted to inbox hero.

Real companies. Real results. See how teams like yours cleaned their lists and transformed their email performance.

TechCorp cut their bounce rate by 95%

TechCorp's email campaigns were hitting an 18% bounce rate. Their domain was flagged by two major ISPs. Open rates had cratered to 12%.

They ran their entire 340,000-contact database through Verifox. Removed 61,200 invalid addresses. Re-verified monthly going forward.

Bounce rate

18%→0.8%

Open rate

12%→34%

Domain health

Flagged→Clean

Monthly savings

$2,400

BarCups went from 22% engagement to 87%

BarCups, an e-commerce brand, had a 180,000-person list they had built over 4 years without any verification. Engagement was at 22%. Their ESP was threatening to suspend their account.

They verified the full list with Verifox. Found 43,000 invalid, 12,000 risky, and 8,000 spam-trap addresses. Removed them all.

List size

180K→117K

Engagement

22%→87%

ESP status

Warning→Good

Revenue lift

+31%

The honest comparison

We built what other tools forgot.

Feature-by-feature, price-by-price — see how Verifox stacks up against the biggest names in email verification.

Feature	Verifox	ZeroBounce	NeverBounce	Clearout	Kickbox
Catch-all resolution
AI confidence scoring
Checks per email	9	7	5	6	5
Accuracy rate	99.2%	98%	97%	97.5%	98%
Free checks (no signup)	3	—	—	—	—
Money-back guarantee
API response time	<1.2s	<3s	<2s	<2.5s	<2s
Pay-as-you-go pricing
Ninja fox mascot

Every tool on this list will verify your emails. The difference is what happens at the edges — the catch-all domains nobody else can crack, the confidence scores that tell you exactly how safe an address is, the guarantee that your money back if accuracy drops below 99%.

Watch it work

From messy list to clean data in 47 seconds.

Watch us verify a 10,000-email list in real time. Upload, verify, download. No setup, no configuration, no waiting around.

Upload a CSV with 10,000 emails
See results populate in real time
Download a clean, scored list

Built for teams like yours

Clean data for every team that sends email.

Whether you send 1,000 emails a month or 10 million — Verifox fits your workflow and protects your sender reputation.

Email Marketing Teams

Stop losing opens to bounces. Verify your list before every campaign to protect your sender score, improve deliverability, and make sure every email you send has a chance of being read.

Sales & Outreach Teams

Cold outreach only works when the email actually arrives. Verify prospect lists before loading them into your sequencer to protect your domain and improve reply rates.

Marketing Agencies

Managing email lists for multiple clients means managing multiple reputations. Verify every client list before sending to protect their deliverability — and yours.

Developers & Product Teams

Verify emails at the point of signup with our API. Catch typos, disposables, and fake signups in real-time before they pollute your database. Under 1.2 seconds per check.

Best practices

Six rules for keeping your email list clean.

Email list hygiene is not a one-time task. Follow these rules to keep your deliverability high and your bounce rate near zero.

Verify before every campaign

Never assume your list is clean just because you verified it last month. Email addresses decay at 2.1% per month. A list verified 90 days ago has already lost 6% of its valid addresses.

Verify at the point of signup

Use real-time API verification on your signup forms to catch typos, disposables, and fake addresses before they enter your database.

Remove role addresses

info@, admin@, support@ — these addresses are rarely monitored by a real person. They inflate your list without adding engagement.

Do not ignore catch-all results

If your verification tool marks addresses as "accept-all" or "unknown," those addresses are not verified. Use a tool that can actually resolve catch-all domains.

Set up automated monthly verification

Email decay does not stop. Set up automated re-verification on a monthly schedule so your list stays clean without manual effort.

Monitor your bounce rate after every send

Verification is not a one-time fix. Track your bounce rate after each campaign and re-verify if it creeps above 1%.

Pricing

Under a penny per email. No subscriptions. No surprises.

Buy credits, use them whenever. They never expire. Start with 100 free credits — no card required.

Starter

200 free credits

Best for: Trying Verifox out

Start Free

Everything you need to know about email verification.

How accurate is Verifox email verification?

Verifox delivers 99.2% accuracy across all verification checks, including catch-all domain resolution. We back this with a money-back guarantee — if your verified list produces more than 1% hard bounces, we refund the credits used.

How long does email verification take?

Single email verification returns results in under 1.2 seconds. Bulk lists are processed at approximately 10,000 emails per minute. A 50,000-email list takes roughly 5 minutes.

What file formats do you accept for bulk verification?

CSV, Excel (.xlsx), and plain text (.txt) files. You can also paste emails directly or send them via API. There is no limit on list size.

What is catch-all email verification and why does it matter?

Catch-all (or accept-all) domains are configured to accept emails sent to any address, even ones that do not exist. Most verification tools cannot determine which addresses on these domains are real. Verifox uses AI-powered pattern analysis to score each address individually, resolving what other tools mark as "unknown."

Do you store the emails I verify?

No. Emails are processed in memory and deleted immediately after verification. We never store, sell, or share your email data. Your lists remain yours.

Can I verify emails in real-time via API?

Yes. Our REST API returns verification results in under 1.2 seconds per email. Full documentation, SDKs for Python, Node.js, PHP, Ruby, and Go, and a sandbox environment are available.

Do credits expire?

No. Credits never expire. Buy them when you need them, use them whenever you want. No subscriptions, no monthly fees, no use-it-or-lose-it pressure.

What happens if I verify a list and the results are inaccurate?

We offer a 99% accuracy money-back guarantee. If your verified list produces a hard bounce rate above 1% when sent through a reputable ESP, contact our support team with the send report and we will refund the credits used for that verification.

From our customers

“We tried three tools before Verifox. Nothing else resolved our catch-all problem.”

— Sarah Kim, Head of Growth at TechCorp

18%→0.8%

bounce rate

$28,800

saved annually

“Paid for itself in the first week.”

Ready?

Stop guessing. Start verifying.

200 free credits. No credit card. No commitment. Just clean data. Your first list is on us.

Verify Your First List Free Or talk to our team about volume pricing

No credit card required