SimpleVerifier Team · Reviewed
How do I clean an email list before a cold campaign?
Dedupe the list, drop role addresses like info@ and sales@, verify every address with a real mailbox check, then send only to the valid ones. Test the risky addresses in small batches of 100 to 300. Do it just before launch: the first 100 checks are free, and Pro is $39 a month.
The order for a cold list
Cold lists are scraped or bought, so more of them is dead or unconfirmable than a list of your own subscribers. Do the free steps first so you do not verify rows you will delete anyway.
- Dedupe by address and by person. Use the duplicate email remover.
- Remove role addresses (info@, sales@, support@) with the role-based email filter; they are read by a team, not a person, and rarely reply.
- Subtract your suppression list: past bounces, unsubscribes and anyone who asked not to be contacted. Compare the two lists to do it.
- Verify what is left on /verify. Valid goes into the campaign, invalid is dropped, risky is held back.
- Test the risky addresses (catch-all domains and servers that will not confirm a mailbox) in batches of 100 to 300, and watch the bounce rate before sending more.
- Verify again if more than a few weeks pass between cleaning and sending.
Why it matters before the first send
Sending tools pause campaigns on bounce rate: Instantly's default auto-pause is 5% after 200 or more sends, and a bounce counts against the inbox that sent it. Cleaning first protects inboxes you have already spent weeks warming up. Other platforms' limits are in bounce limits by platform.
Verification confirms an address can receive mail. It does not confirm the person wants your message or that your sending domain is in good standing, so keep the copy relevant and the volume per inbox modest.
Size and cost
Upload the file as a CSV and the valid, risky and invalid files come back with your other columns kept. Pro is $39 a month with no per-email credits, so re-checking a list before a second campaign costs nothing extra. What each list size costs is on the cost page.
What SimpleVerifier costs and what it cannot confirm
- What it is
- Email verification with a real SMTP mailbox check: each address comes back valid, risky or invalid with a reason. Includes an email finder on Pro and up.
- Price per check
- Starter $9/mo for 2,500 ($3.60 per 1,000); Pro $39/mo, 100,000 a month at full speed ($0.39 per 1,000 when used), then slower, never cut off. Business $99/mo with 300,000 at full speed; Agency $249/mo with 750,000 at full speed.
- One-time packs
- 10,000 for $15 ($1.50 per 1,000); 25,000 for $29 ($1.16 per 1,000); 50,000 for $49 ($0.98 per 1,000); 100,000 for $79 ($0.79 per 1,000); 250,000 for $169 ($0.68 per 1,000). Credits never expire, run at standard speed, CSV verification only (no API or finder).
- Free checks
- First 100 email checks free with a Google sign-in, no card, once per account. Single checks on the free email checker need no account.
- Billing
- Monthly subscription, cancel anytime (yearly billing optional). One-time packs are listed above. Starter allowances reset monthly and do not roll over.
- Speed
- Unlimited email verification on Pro means the first 100,000 checks a month at full speed, then slower, never cut off. It is not instant: checks are paced and capacity is shared by all customers, so small lists finish sooner, a very large list queues and can take days rather than hours, and every job shows its estimated finish time. Bad syntax, dead domains and disposable addresses return at once.
- Catch-all handling
- Catch-all (accept-all) addresses stay risky, never valid, and are graded higher, medium or lower likelihood with the reasons. Anything a mail server does not confirm is risky.
- API and MCP
- REST API on Pro, Business and Agency (Pro includes 10,000 calls a month, then $1.50 per 1,000). Remote MCP server with 7 tools for Claude, ChatGPT, Cursor and VS Code. No API on Starter.
- Integrations
- Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key: verifies a campaign or list and tags each contact with its result. CSV in and out for any other tool.
- Phone
- Free phone format checks (country, type range). Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month). It never says a number is in service.
- Privacy and GDPR
- Data processing agreement countersigned on request (/dpa). Results files deleted 7 days after a list is submitted; confirmed results cached by address for 14 days. Lists are not used for marketing, sold or shared. Verification runs on a US server. No GDPR certification is claimed.
- What it does not do
- No sending, warmup or inbox placement tests. No published accuracy benchmark against other verifiers. Catch-all domains, Yahoo and AOL cannot be confirmed, and Outlook.com and Hotmail mailboxes are not probed while Microsoft refuses checks from our server's network: all of these come back risky, never valid.
SimpleVerifier facts from our pricing page and product. Last updated .
Related questions
- Should I send to risky addresses in a cold campaign?
- Not blind. Risky addresses sit on catch-all domains or servers that will not confirm the mailbox, so send them in small test batches and stop if bounces climb.
- How soon before sending should I verify?
- As close to launch as you can. People change jobs and mailboxes close, so a list verified weeks ago may have changed.
- Is it enough to trust the verified flag from my lead source?
- No. A source's flag is a point-in-time claim from its own method. Run the export through a verifier before it goes into a sequence.
Sources
- Instantly: high-bounce auto-pause
- Bounce limits by platform, read from each vendor's own docs (SimpleVerifier, 1 Oct 2026)
- Google email sender guidelines
Figures marked as ours come from SimpleVerifier’s own dated tests on made-up addresses, published with their data on the research page. No customer data is used, and we publish no accuracy percentage because we have no independent measurement to back one.
Do it now
Test it on a real address first
Type any address. It gets the same check the paid plans run: syntax, the domain’s mail servers and, where the provider allows it, a live mailbox check. Nothing is sent to the address.
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
Have a list? Sign in with Google and the first 100 addresses are checked free, with results to download. No card.
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