Connect MailTester Ninja to the tools you already use. Every integration below is the same simple call to our REST API, so you can verify email addresses in real time inside your automations, spreadsheets, CRM or code. Each address is checked live against the recipient’s mail server, and nothing is stored.
Try any of them for free: get a free API token in one click (50 checks a day), then switch to a paid plan for full speed.
No-code and automation
n8n
One HTTP Request node and an importable workflow that splits valid from invalid addresses.
n8n integration
Zapier
Make
HTTP Make a request module and a router that sends valid, invalid and uncertain addresses their own way.
Make integration
Clay
HTTP API enrichment column that verifies every row before you push contacts to your sequencer.
Clay integrationSpreadsheets
Google Sheets
An Apps Script that adds a =MT_VERIFY(A2) formula and verifies a whole column, no install.
AI agents
OpenAI tool calling
A verify_email tool your GPT model can call before it writes or sends.
OpenAI example
Claude tool use
The same tool for Claude, with the verdict returned as structured data.
Claude example
LangChain
Ready-to-use prompts
System prompts and guardrails so an assistant uses the verdicts correctly.
PromptsCode
Copy and paste examples, each one the same call wrapped for your language:
cURL
Python
Node.js
PHP
Go
Ruby
Java
C#Developer resources
- API documentation: one GET request per address, JSON verdict (
ok,ko,mb). - OpenAPI 3.1 specification: import it into Postman, Swagger, Power Automate or an AI agent.
- Free API token: 50 checks a day, or
key=freefor 10 a day with no token. - All examples on GitHub.
Questions
Do I need a paid plan to use an integration?
No. Every integration works with a free API token (50 checks a day, one request every 30 seconds). Paid plans remove the wait and go up to 200,000 checks a day per key.
Is there a native app in Zapier, Make or n8n?
Not yet. Each tool’s generic HTTP step does the same job today, and the setup takes a couple of minutes. Native apps are planned, and this page will list them as they go live.
My tool is not listed. Can I still use MailTester Ninja?
Yes, if your tool can call a web address (an HTTP request or a webhook step), it can use our API. Tell us which tool you use through our contact page.