Can I use the email verifier without a plan?

Yes. The WarmySender email verifier is a standalone tool — you do not need a WarmySender subscription to use it. There are three ways in, and you can use whichever fits: check one email address a day free, with no sign-up, on the email verifier page; buy verification credits on their own, with no plan attached, from $79 for 100,000 addresses up to $499 for 1,000,000 — and they never expire; or take a plan, which includes a monthly verification allowance on top of everything else. Whichever route you use, you are only ever charged for an answer we could actually confirm — an “unknown” result is always free.

WarmySender runs your outreach on autopilot with AI agents, across Cold Email, Email Warmup, LinkedIn, Instagram and Multichannel sequences — plus real-time email verification. The Email Verifier is part of Cold Emailing: clean your list before you send so more of your messages reach the inbox and your sender reputation stays strong. You can use it entirely on its own, without ever sending an email from WarmySender.

The three ways to verify, side by side

Credits and a plan allowance stack: if you have both, your monthly allowance is spent first and your credits wait in reserve behind it, so you never burn something you bought while you still have something free.

The free daily check — one free check a day, no sign-up

Open the email verifier, type an address, and press check. That’s the whole flow — no account, no card, no trial to start.

• one email address a day. The free check covers a single address at a time, and it refreshes every day, so you can come back tomorrow and check another one.
• It is the same check. You get the identical result you’d get on a paid list — same answer, same confidence, no watered-down “preview” version.
• Nothing is charged, ever. The free check does not use a credit and does not touch a plan allowance, so it can never quietly eat something you paid for.
• Signed in with no plan and no credits? You still get it. Creating an account never makes the tool worse than being logged out — an account with no plan and no credit balance gets the same free check each day.
• Single addresses only. Uploading a list or running a batch needs credits or a plan allowance — there’s no way to string free checks together into a list.

Credits: buy verifications on their own, no subscription

Credits are the route most people take. They are a one-time purchase with no subscription attached — you are not signing up for a plan, and nothing renews.

• One credit verifies one address. It doesn’t matter whether you check a single address or upload a list of thousands — each address you get a confirmed answer for uses one credit.
• Credits never expire. Buy a pack today and spend it next week, next month, or next year. There is no expiry date and nothing is forfeited.
• They are added instantly. Your balance goes up the moment the purchase completes — there is nothing to schedule or activate.
• They stay yours. If you later take a plan, change plans, or cancel one, your credit balance is untouched. Credits sit alongside whatever else you have.
• They aren’t held to a daily pace. A plan’s monthly allowance is spread gently across the month; credits are not, so a credit pack is how you clear a big list today.

What credits cost

Prices are one-time and in US dollars. The larger the pack, the lower the cost per address — the 360,000-credit pack at $237 works out at $0.66 per 1,000. And because unknown results are free, the real number of addresses a pack gets through is usually a little higher than its headline count.

A worked example: cleaning a 5,000-address list

Here is the whole thing with real numbers. You have a 5,000-address list and no WarmySender plan.

1. Buy the pack that covers it. The 100,000-credit pack costs $79 — that’s $0.79 per 1,000 addresses. No subscription, nothing renews.
2. Upload the list. A single file holds up to 20,000 addresses, so 5,000 goes up in one go. Results fill in as it works through them.
3. Pay for confirmed answers only. Say 400 of those 5,000 come back unknown — those cost nothing. You are charged 4,600 credits, not 5,000, and the remaining 95,400 credits stay on your account for next time. They don’t expire.
4. Take the clean list. Download the results as a spreadsheet, or turn the good addresses into a ready-to-use list in one click if you also want to send from WarmySender.

Bottom line: $79, once, with no plan and nothing recurring — and you finish with leftover credits in the bank.

Exactly what gets charged — and what doesn’t

This is the short, complete list. There are no other charges.

Unknown is free, always, on every route. If we can’t give you an answer, we don’t bill you for one — that rule doesn’t change between the free check, credits, and a plan allowance. It also means a list full of hard-to-check addresses costs you less, not more.

Cancel a run and unused credits come straight back. Stop a list partway through and the credits for every address that hadn’t been checked yet return to your balance immediately. You keep paying only for the answers you actually received.

What each result means, and what to do with it

The full breakdown, with more on borderline cases, is in what your verification results mean.

Why an accept-all domain can’t be resolved by anyone — and how we label it

Some domains are configured to accept mail for every address, real or not. A mail server set up that way answers “yes, send it” to anything — [email protected] and [email protected] get the same welcome. That is a deliberate choice by whoever runs the domain, usually so nothing is ever bounced by accident.

The consequence is simple and it applies to every verification tool that exists, ours included: there is no question you can ask that domain that separates a real mailbox from a fake one. The only signal available is the one the domain gives everybody, and it is always the same. No amount of retrying, no clever technique, and no competitor changes that — the information genuinely isn’t there to be had.

So here is what we do about it, and it’s the honest option rather than the flattering one:

• We label it risky, not valid. Some tools mark every address on an accept-all domain as “valid” because the server said yes. That produces a beautiful-looking report and a bounce rate you find out about later. We’d rather tell you what we actually know: the domain is live and accepting, the specific mailbox is unconfirmed.
• We say so in plain words. The result explains that the domain accepts every address, so you can weigh it yourself rather than guess at what a colour code meant.
• We count it separately. When you turn results into a list, confirmed mailboxes and accept-all addresses are reported as two numbers, not blended into one total — so you always know what you actually have.
• It still counts as a confirmed answer. “This domain accepts everything” is a real, useful finding we went and got, so it uses a credit. What we couldn’t establish at all comes back as unknown, and that’s free.

What to do with them: accept-all addresses are frequently real, deliverable people — plenty of well-run companies use that setup. Send to them, but do it with warmup running on your mailbox so your reputation is protected if some of them turn out not to exist. If a list is overwhelmingly accept-all, that’s a signal to weight your outreach toward the confirmed addresses first.

When a plan is the better move

Straight answer: if all you want is verification, credits are the cheaper route — they cost from $0.66 per 1,000 addresses with nothing recurring, and no plan beats that on price per address. A plan makes sense when you want the rest of the platform, and the monthly verification allowance rides along for free:

Already on the older Business plan? You keep 1,000 verifications a month. Business is grandfathered for existing subscribers; the plans above are the current lineup.

Take a plan when you want to send, not just check: cold email campaigns, email warmup that builds and protects your sender reputation, LinkedIn, Instagram, and multichannel sequences that combine them. The monthly verification allowance then covers your routine list hygiene at no extra cost, and you can still buy credits on top for a one-off big clean. See the pricing page for what each plan includes, or how the monthly and daily allowances work for the mechanics.

Frequently asked questions

Can I use the WarmySender email verifier without a subscription?

Yes. The verifier works as a standalone tool with no WarmySender subscription. You can check one email address a day free with no sign-up at all, and you can buy verification credits on their own — a one-time purchase with no plan attached and nothing that renews. Packs run from $79 for 100,000 addresses up to $499 for 1,000,000, and the credits never expire. A subscription adds a monthly verification allowance on top, but it has never been the only way in and is not required.

How does the free daily check work?

Open the email verifier, type one address, and press check — that’s it. No account, no card, no trial. You get one email address a day, and it refreshes the next day. It’s the same check you’d get on a paid list, not a limited preview, and it never uses a credit or touches a plan allowance. If you do have an account but no plan and no credits, you still get the free check each day — signing up never makes the tool worse than being logged out. The one thing it doesn’t cover is uploads: verifying a whole list needs credits or a plan allowance.

How much does it cost to verify a list of emails?

Credits are one-time packs: 100,000 for $79, 220,000 for $158, 360,000 for $237, 520,000 for $316, 700,000 for $395, 1,000,000 for $499. One credit verifies one address, so a 5,000-address list is covered by the 100,000-credit pack at $79 — about $0.79 per 1,000 addresses — with credits left over for next time. In practice you’ll usually pay less than the list size, because unknown results are free and never use a credit. Nothing renews, and unused credits never expire.

Do verification credits expire?

No. Purchased credits never expire — they stay on your account until you spend them, however long that takes. That’s the main difference from a plan’s monthly allowance, which refreshes each month and doesn’t roll over. Credits also survive everything else: taking a plan, switching plans, or cancelling one leaves your credit balance exactly as it was.

What exactly am I charged for?

Only for an answer we could confirm. Valid, invalid, and risky results each use one credit. An unknown result is always free, on every route — the free daily check, credits, and a plan allowance alike — because we won’t bill you for an answer we couldn’t actually give. If you cancel a run partway through, the credits for every address that hadn’t been checked yet come straight back to your balance. And the free daily check is never charged and never touches a credit or an allowance.

What does an “unknown” result mean, and why is it free?

Unknown means we couldn’t get a definite answer either way — it does not mean the address is bad. It usually happens with large, security-conscious business domains that deliberately give everyone the same neutral answer, so no tool can learn anything from it. Since that’s the receiving side keeping its answer private rather than anything wrong with the address, charging you for it would be charging you for nothing. Unknown addresses are commonly real and are usually safe to email with warmup running on your sending mailbox. And because they’re free, re-checking them later costs you nothing.

Why can’t you tell me if an address on a catch-all domain is real?

Because the domain is configured to accept mail for every address, real or not — so it gives the identical answer for a genuine mailbox and an invented one. That isn’t a gap in our checking; the distinguishing information does not exist for any tool to find, ours or anyone else’s. We label those addresses risky rather than calling them valid, we say plainly that the domain accepts everything, and when you build a list from your results we report confirmed mailboxes and accept-all addresses as two separate numbers instead of one flattering total. Many accept-all addresses are real people, so they’re usually worth emailing — just do it with warmup running so your reputation is protected.

Do I need to create an account to buy credits?

Yes — credits are a balance, so they need an account to live on. Creating one is free and doesn’t start a subscription or a trial you have to cancel; it’s just where your credits and your verification history sit. The free daily check needs no account at all, so you can try the verifier before creating anything.

Should I buy credits or take a plan?

If verification is all you need, buy credits — from $0.66 per 1,000 addresses with nothing recurring, that’s the cheaper route per address, and the credits never expire. Take a plan when you also want to send: cold email campaigns, email warmup to build and protect your sender reputation, LinkedIn, Instagram, and multichannel sequences. Every plan then includes a monthly verification allowance at no extra charge — 300 a month on Pro, 1,500 on Enterprise, and 10,000 on Ultimate — and you can still buy credits on top for an occasional large clean. Plenty of people do both.

How many addresses can I verify at once?

A single file can hold up to 20,000 addresses. If your list is bigger than that, split it into a few files and upload them one after another — there’s no limit on how many files you run overall, only on how big each one is. Keeping each file to that size keeps every result fast and accurate and makes progress easy to follow. The free daily check is single-address only; uploads need credits or a plan allowance.

Is the free check as good as the paid one?

It’s the identical check. Same method, same result, same confidence — there is no reduced “free tier” version that hedges its answer. The only difference is quantity: the free route covers one email address a day, while credits and a plan allowance let you run lists.

Related reading

• Email Verifier — try the free daily check right now, no sign-up
• Email verification limits & credits — the complete guide to how allowances, the daily pace, and credits fit together
• What your verification results mean — valid, risky, unknown, and invalid explained in full
• Use your verified list in a campaign — turn results into a clean, ready-to-send audience with no duplicates
• Control your warmup sending volume — protect your reputation once you start sending
• Pricing — what each plan includes, including its monthly verification allowance
• Full documentation — Cold Email, Email Warmup, LinkedIn, Instagram and Multichannel guides