Sandbox for safe email testing

Capture SMTP traffic from staging and dev environments.

Automate test flows and scenarios with flexible API.

Analyze email content for spam score and validate HTML/CSS.

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Email testing challenges that Sandbox solves

Configure your testing environment in 5 minutes

Each account comes with an individual testing environment. Integrate it with your app in just a few clicks.

Keep all testing data organized in one place

Create individual sandboxes for different environments or review servers and group them into relevant projects.

Quickly integrate with Sandbox API

Get started quickly with our well-documented API and configure automated testing with unlimited API calls.

Dig into both the content and source of your emails

View messages, check spam scores, validate headers, analyze the HTML support across email clients, and more.

Easily share test emails with your team

Manage access to your sandboxes for colleagues or clients. Send selected test emails to whitelisted real recipients.

Test your email sending service

Send emails to Email Sandbox account directly from your CRM or email sending service. Simulate sending to multiple recipients.

Setup takes less than 5 minutes

Email Sandbox is compatible with any app or framework that supports SMTP

Select your integration from 20+ code samples or copy SMTP credentials
Paste the configuration to your project
Run your email sending code
Instantly receive a message in your sandbox

How different teams use Email Sandbox

Developers

Experiment with the email sending functionality
Cover code with tests to run automated checks via Sandbox API
Verify different email aspects, debug sending script and HTML template

QAs

Run safe email tests in staging and/or testing environment
Integrate Sandbox API with automated testing tools
Compare revised emails with their previous versions

Marketers and managers

Smoothly collaborate with development and QA teams
View test emails in shared sandboxes or forward to recipients
Send emails to testing sandboxes from CRMs and common sending tools

From our #BestClientsEver

Tom Ravn

@TomR4vn

I am testing Mailtrap last weeks. You can send emails from your domain for free. They allow 1000 mails/month. It is quite ok. It can be used with good old SMTP connection or via API. https://mailtrap.io/

12:49 PM – 20 Feb 2023

Joshua Lim S. Ming

@limshengming

I’ve dreaded setting up VPS’ to work with an external SMTP but @Mailtrap made things so easy! They’ve got the code and everything that you can copy and paste!

12:35 PM – 2 Dec 2022

Tr1p

@tr1pwyr

Y’all know what’s really good? https://mailtrap.io/ @Mailtrap

3:44 PM – 16 May 2023

Joshua Anderton

@joshuaanderton

Just signed up for @Mailtrap and I’m loving it. So easy to set up. Provides so much peace of mind. Ahh just love it.

7:38 PM – 13 Jan 2021

DeveloperMitch

@mitchellfinlay

After all these years of web development, how have I only JUST started using @Mailtrap. I had heard about it, but never got round to using it. An awesome way of testing emails 👏

1:25 PM – 7 Nov 2020

Alessandro Rodi

@coorasse

I love @Mailtrap. It removes all the asshole of configuring email servers in test environments. Great service! Is totally worth your money!

1:15 PM – 20 Oct 2020

Mr. Glass

@MisterGlass

Shout out to @Mailtrap, hands down the best way to handle mail sending in local/test environments.

11:43 PM – 21 May 2020

Rado Georgiev

@Rado_g

One thing we started using recently is @Mailtrap for our dev & staging environments. We were previously either turning email sending entirely off for staging or running SES + whitelist. Turns out, having a fake SMTP mailbox is great and you can test better with it.

1:32 PM – 6 Jan 2021

Doug Black Jr

@dougblackjr

Can we all agree @Mailtrap is a gift to developers everywhere? It just works SO easily out of the box!!!!

9:45 PM – 11 Aug 2020

Frequently Asked Questions

Can Email Sandbox send emails to real recipients inboxes?

Email Sandbox is a testing tool and is not designed to deliver emails to real email addresses. But you can use our Email API or SMTP service to send emails to your recipients.

How can I preview my email in different email clients?

Device Previews renders your email the way real clients display it – iOS Mail, Gmail, Outlook, Apple Mail – on mobile, desktop, and web, with no forwarding and no extra app. HTML Checker covers the other half: it analyzes your template for HTML/CSS support across those clients and explains how to fix errors right away.

Can I send a test email to testing sandbox from my Gmail?

Yes, you can! On Business, Premium, and Enterprise plans, there is a separate email address available for each of your sandboxes. With it, you can send messages from any CRM, email sending app or client, such as Gmail, Hubspot, SendGrid, etc.

How much does Email Sandbox cost?

Sandbox features a forever free plan that offers the basic functionality for personal use of Email Sandbox. Paid plans start from $17 per month, and are suitable for companies of different sizes. View the Mailtrap pricing for more details.