Buyer guide · SimpleVerifier Team
Email verification for cold email agencies
A cold email agency sends from inboxes it must keep healthy for every client at once, so a bad list from one client can cost the others. Verify each client's list before it is loaded into the sending tool and send only to valid rows. Pro is $39 a month, Starter is $9 a month for 2,500 checks, and the first 100 checks are free.
An agency does not own its lists. They arrive from the client's old CRM, a scraper, a data vendor or a founder's spreadsheet, in whatever shape and age they happen to be in, and the agency is still the one judged on reply rates and inbox health.
The cheapest control point is the gap between receiving the file and uploading it to the sequencer. Everything after that costs sending reputation to fix.
SimpleVerifier facts: prices, packs and limits
- 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 today
- Capacity is shared by every customer: plan on about 13,000 mailbox checks a day in the standard lane (more when the queue is quiet). Bad syntax, dead domains and disposable addresses return at once; a list of 100,000 takes days, not hours, and each job shows its estimated finish time.
- 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 6 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 .
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.
By continuing you agree to our Terms and Privacy Policy.
Where an agency's lists go wrong
Client-supplied lists are the riskiest input: a founder's six-year-old customer export has people who changed jobs, and a vendor list can hold guessed addresses. The same sending domains and warmed inboxes serve several clients, so bounces from one campaign sit in the same reputation history as the next client's.
Spam traps are the fear behind most agency list rules. No verifier can name a spam trap for certain, and we do not claim to. What verification does is remove the dead, abandoned and unreachable addresses that recycled traps are made from, along with the plain bounces, so there are fewer places for a trap to hide.
Re-sends are the second leak. A list that was clean in March is not clean in September, so a reused list needs another pass before the new sequence, not just the first one.
How SimpleVerifier fits an agency's process
Upload each client's CSV as its own job so results stay separated by client in your history. Valid rows go to the sequencer; invalid rows are dropped; risky rows, mostly catch-all domains, are held back or sent in a small separate wave so they cannot drag a campaign's bounce rate.
If your agency has several people building lists, a team plan gives each their own sign-in on shared volume: see email verification for teams.
Every result is valid, risky or invalid with a plain reason beside it, such as "Mailbox exists", "Mailbox not found", "Accepts all addresses", "Disposable address", "No mail server", "Server would not confirm" or "Provider hides mailbox status".
A per-client workflow
Step one: receive the client file and save it as client-name-raw.csv. Step two: upload it and wait for the job to finish. Step three: download the valid rows as the send list and the invalid rows as the client's suppression list.
Step four: load only the send list into the sequencing tool. Step five: when a campaign finishes, add the bounced addresses from the tool to the client's suppression list and check the campaign's bounce rate against the share of risky rows you included.
Which plan fits, and what it costs
Starter is $9 a month for 2,500 checks; unused checks don't roll over. Pro is $39 a month with no per-email credits: never cut off: the first 100,000 emails a month run at full speed, then big lists run slower. Cold email agencies usually start on Starter for a single list and move to Pro once lists arrive every month. The first 100 checks are free with a Google sign-in, no card, on the same engine the paid plans use.
Pro includes 10,000 calls a month included, then $1.50 per 1,000. CSV cleans in the dashboard don't draw on API calls. The same checks are available to AI agents over MCP at https://simpleverifier.com/api/mcp.
How long it takes
Mailbox checks are paced, because mail servers slow down or block verifiers that probe too fast, and the daily check capacity is shared between customers. Addresses that need no mailbox check, such as broken syntax, dead domains and disposable addresses, come back at once. The rest run in a queue, and the job card shows an estimated finish time. Start the check before the send is due, and you can close the tab: the results wait in your history.
Common questions
- Can verification guarantee no spam traps?
- No. No verifier can identify every spam trap. Verifying removes dead and abandoned addresses and cuts bounces, which lowers risk but does not remove it.
- Do I need a separate account per client?
- Not to keep results apart. Each upload is its own job in your history. Larger agencies can look at the team and agency plans for seats and client workspaces.
- How often should I re-verify a client list?
- Before every new sequence on a list you have used before. Addresses go stale month by month.
- How do I try it first?
- The first 100 checks are free with a Google sign-in, no card, on the same engine the paid plans use.
- What does it cost?
- Starter is $9 a month for 2,500 checks, or Pro at $39 a month: never cut off: the first 100,000 emails a month run at full speed, then big lists run slower. Plans are monthly or yearly and cancel from your account.
Check a client list
Pro is $39 a month and never cuts you off: the first 100,000 emails a month run at full speed, then big lists run slower. CSV uploads, the API (10,000 calls a month, then $1.50 per 1,000), the Google Sheets add-on and the email finder are included, and you can cancel any time. For smaller volumes, Starter is $9 a month for 2,500 emails a month.
The first 100 email checks are free with a Google sign-in, no card, on the same engine the paid plans use.