How to Use Temp Mail for Automation Testing in Postman
If you’ve ever had to test user registration, password resets, or email verification in your application, you know how painful it can be to use real email addresses over and over. Not only is it time-consuming, but it also clutters your inbox and slows down the testing process.
That’s where temporary email services,like MTEMPMAIL.com become a QA tester’s best friend. And when you pair it with Postman, you can fully automate your testing process without ever refreshing a real inbox.
In this guide, we’ll walk you through how to use MTEMPMAIL in Postman to test email-based workflows faster and smarter.
Why Use Temp Mail in Testing?
Temporary email addresses are disposable email inboxes you can use to:
- Sign up for services without using your personal email
- Automate email-based testing (OTP, verification links, etc.)
- Prevent your real inbox from being flooded with test emails
And when paired with Postman, you can automate the entire process from email creation to inbox monitoring.
The Problem: Testing Email Features Manually Is a Pain
Let’s be real, no one enjoys:
- Creating dozens of dummy Gmail accounts
- Constantly logging in to check for emails
Manually copying and pasting OTP codes or confirmation links
This process slows down your test cycles and introduces human error. But by using MTEMPMAIL’s free temp mail API, you can automate the inbox part of your test and make your QA process far more efficient.
Tools You’ll Need:
- A free temp mail provider like MTEMPMAIL.com
- Postman (installed on your computer or use the web version)
- Basic knowledge of using REST APIs
Step-by-Step Guide: Using MTEMPMAIL with Postman
Step 1: Create a New Temporary Email
- Open Postman.
- Set the method to GET.
- Use this endpoint:
https://mtempmail.com/api/v1/mailbox
- Click Send.
You’ll receive a response like this:
"email": "test123@mtempmail.com",
"token": “abc123xyz456”
Save the token, you’ll need to check for incoming messages.
Step 2: Use the Temp Email in Your App
Now take the generated email (like test123@mtempmail.com) and use it in your test case for example, enter it in your app’s sign-up form.
Your app should send a confirmation or verification email to that address.
Step 3: Check for the Email in Postman
- In Postman, create a new request.
- Set it to GET.
- Use this URL, replacing YOUR_TOKEN with the token from Step 1:
https://mtempmail.com/api/v1/mailbox?token=YOUR_TOKEN
- Click Send.
The response will contain all the emails sent to your temp address. It might look like this:
from: "no-reply@yourapp.com"
subject: "Verify your account"
body: "Click here to verify your email..."
Now you can grab the email content, extract the verification code or link, and continue your test case.
Automate the Process
If you want to go deeper:
- Use Postman test scripts to store the email token as an environment variable.
- Chain multiple requests: generate email → trigger app flow → check inbox → extract data.
- Run tests in Postman Collections for continuous integration with CI/CD pipelines.
Pro Tip: Automate with Postman Variables
Want to go even further?
- Save the generated email and token in environment variables
- Chain requests inside a Postman Collection
- Write simple JavaScript tests to extract data (like OTP codes) automatically
This allows you to run complete end-to-end tests with minimal manual work.
Why This Matters
Automating email testing used to be difficult and slow. But using MTEMPMAIL with Postman:
- Saves time manually checking emails
- Reduces test setup complexity
- Supports full-cycle verification without user interaction
Works great for staging and QA environments
A Quick Note on Privacy
MTEMPMAIL is a public email system. It’s safe for testing, but not for personal or sensitive data. Always avoid using temp mails for real accounts or confidential information.
Final Thoughts
Email-based features are a core part of many apps, but they’re also tricky to test. With MTEMPMAIL and Postman, you can automate email testing easily, without compromising your real inbox or writing extra code.
If you haven’t tried it yet, head over to MTEMPMAIL.com and simplify your QA workflow today.
