# MailTester.ninja review (2026): is the free plan enough? > Real-time email verifier and finder with a REST API Checked Nov 13, 2026 ยท graded Nov 13, 2026 by ToolGPA. MailTester.ninja checks whether an email address exists by asking the recipient's mail server, without sending a message, and says it stores none of the addresses submitted. It also finds work email addresses from a name and company domain. One-off checks are free, and paid keys raise the daily limit and unlock the API. - **Category:** Email Verification & Deliverability - **Made by:** Unlimited & Limited - **Website:** https://mailtester.ninja - **Runs on:** Web - **Who should skip it:** Tight if you work in bursts, as requests over the daily limit are refused until the next day. - **Facts last checked:** Nov 13, 2026 ## Pricing As of Nov 13, 2026, MailTester.ninja has a free plan, and paid plans start at $6.99 per week for up to 100,000 checks a day; $23.99 per month for the same limit. - **Pricing model:** Free plan - **Free plan:** One-off checks on the website are free with no signup. The API allows 10 checks a day with key=free, or 50 a day with a free token valid for 7 days. - **Free trial:** None listed. | Plan | Price | What you get | | --- | --- | --- | | Starter | $6.99 per week, billed weekly | Up to 100,000 verifications and 100,000 API calls a day. Cancel any time. | | Pro | $23.99 per month, billed monthly | Up to 100,000 verifications and 100,000 API calls a day. | | Ultimate | $39.99 per month, billed monthly | Up to 200,000 verifications and 200,000 API calls a day. A quantity above 1 multiplies the limit, so 5 gives 1 million a day. | Read from https://mailtester.ninja/verify-emails-unlimited/ on Nov 13, 2026. Prices change, so confirm with MailTester.ninja before buying. ## Key features - **Live mailbox check:** Each address is tested against the recipient's mail server (syntax, DNS, MX and an SMTP handshake). No message is sent, and the page says no copy of the address is kept. - **Verdict codes:** Results are ok, ko (invalid) or mb (unverifiable), with messages such as Catch-All, Disposable, Greylisted, Timeout and No MX. - **Email finder:** Tries common address formats such as first.last and flast for a name and company domain, and returns the first the server accepts. The Finder API needs a paid key. - **REST API, SDKs and MCP server:** Two endpoints, an OpenAPI 3.1 spec, JavaScript and Python SDKs and an MCP server for AI agents. - **Deliverability tools:** The site also offers a domain audit report, a sender score test for a sent email and a blocklist checker. ## Good for - Cold-outreach teams verifying large lists at a flat price - Developers adding a verification call to automations - Users who want to check single addresses without signing up ## Worth knowing - Free API calls are limited to one request every 30 seconds, and 10 or 50 checks a day. - Plans are priced by a daily limit, not a credit balance: requests above it are refused until the next day. - Starter is billed weekly; the monthly plans are Pro and Ultimate. - An accepted address on a catch-all domain cannot be confirmed to exist. ## ToolGPA grades **GPA: 2.2 out of 4**, graded Nov 13, 2026. MailTester.ninja verifies addresses live and has an email finder, a REST API, SDKs and an MCP server. You pay for a daily limit rather than credits, so requests over it are refused until the next day. - **Value for money: C.** Pro is $23.99 a month, and the weekly Starter is $6.99, about $30 a month. The category's middle is $23. - **Free plan and trial: C.** One-off checks on the site are free with no signup. The free API allows 10 checks a day, or 50 with a 7-day token, one request every 30 seconds. - **Features: C.** Live mailbox check, verdict codes, finder and tools. An accepted address on a catch-all domain cannot be confirmed to exist. - **Ease of use: C.** No rating on record. Paste an address or call the API; the daily-limit model needs some thought. - **Platforms and integrations: B.** Web only, but with a REST API, SDKs, an MCP server and a list of integrations. These are ToolGPA's own grades. Graded from this listing, whose facts were read from MailTester.ninja's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among email verification and deliverability tools - MailTester.ninja's GPA of 2.2 is higher than 23 of the 61 other email verification and deliverability tools we grade, and level with 13. - It stands best on platforms and integrations (B, above 28 of 61) and worst on features (C, above 0). - Its paid plans start at $30.29 a month, against a middle price of $21.50 for the category: 29 of the 43 others that charge start lower. - On features, ease of use and platforms it scores 2.3 out of 4. 7 tools score higher and cost less. The category's chart of price against score: https://toolgpa.com/charts/email-deliverability ## Keep it, or make your own? **Keep it.** Nothing MailTester.ninja does is plain enough to make in a weekend. The 2 things listed below take a company. It costs $363.48 a year. - You could not: Checking that an address exists without writing to it. - You could not: It plugs into other products, n8n, Zapier and Make among them, and has an API. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with n8n, Zapier, Make, Clay, Mailchimp, Brevo, GetResponse, Apify **Tags:** Email verification, Public API ## Alternatives - [Bouncer](https://toolgpa.com/tools/bouncer): Email list verification with credits that never expire. [Compare](https://toolgpa.com/compare/bouncer-vs-mailtester-ninja) - [ZeroBounce](https://toolgpa.com/tools/zerobounce): Email list verification with warm-up and DMARC monitoring in one plan. [Compare](https://toolgpa.com/compare/mailtester-ninja-vs-zerobounce) - [Emailable](https://toolgpa.com/tools/emailable): Email list verification with inbox reports and blacklist monitoring. [Compare](https://toolgpa.com/compare/emailable-vs-mailtester-ninja) - [MillionVerifier](https://toolgpa.com/tools/millionverifier): Low-cost bulk email verification with credits that never expire. [Compare](https://toolgpa.com/compare/mailtester-ninja-vs-millionverifier) - [Reoon Email Verifier](https://toolgpa.com/tools/reoon): Bulk and real-time email verification with refunds on unknowns. [Compare](https://toolgpa.com/compare/mailtester-ninja-vs-reoon) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 13, 2026: - https://mailtester.ninja/verify-emails-unlimited/ - https://mailtester.ninja - https://mailtester.ninja/api/ - https://mailtester.ninja/integrations/ - https://mailtester.ninja/email-verifier/ Page: https://toolgpa.com/tools/mailtester-ninja Listed by ToolGPA (toolgpa.com).