Mailosaur for...

Engineering

Automate and test email and SMS workflows

Quality Assurance

Empower your team and improve email quality

Product Management

Demo and improve your product using email and SMS

Marketing

Deliver high-quality, targeted email campaigns

Solutions

Email Testing

Create end-to-end tests that depend on email

SMS Testing

Automate and use SMS messages during testing

Email Previews

View your email in Gmail, Outlook and mobile devices

Test automation

See how easy it is to automate all the tests you thought you couldn't

Features

Rules

Create automated rules that simulate every type of scenario including email bounces and out-of-office replies

Custom Domains

Unlimited recognisable email addresses for your brand

Enterprise SSO

Centralized security for your organization

Forwarding Rules

Set up rules that automatically forward your emails to certain inboxes

Links and Codes

Peace of mind that you are sending exactly what you mean to, everytime

Message Analysis

Ensuring the quality of your content is never compromised

Sending, Replying and Forwarding Emails

Seamless email and SMS interactions, every time

Virtual SMTP Servers

Use Mailosaur as a dummy SMTP server to catch every email your product sends

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Blog

Explore the Mailosaur blog for expert insights on email & SMS testing, automation, and quality assurance

Mailosaur vs Competitors

Choosing the best email preview tool for you in 2026

Rising prices or limited functionality forcing you to look for a new tool? Take a look at our side by side comparison so you can make an informed decision.

"Transitioning from manual testing to automated QA" with a Mailosaur user interface showing automated tests running

Best practices

Moving from manual QA to QA automation

Have you been considering a switch from manual to automated QA testing? It could be a great move for your career. Sure, it might take some time to learn new skills and tools, but the benefits could be well worth the effort. Explore the possibilities of a career in QA Automation.

News

How Selenium 4.40 improves end-to-end email verification testing

What's changed in Selenium 4.40 and how will it benefit you when testing email verification flows?

Playwright

Automate email verification testing in Playwright (links + OTPs)

Test email verification flows, including magic links and OTPs quickly and easily with Playwright

Best practices

Top tips for email testing in CI/CD pipelines

Automate email verification, catch failures early, and protect user trust without manual guesswork.

"How to move from manual to automated testing" with a simplified version of the Mailosaur UI showing automated testing.

Best practices

How to move from manual to automated email and SMS testing

QAA is an essential part of modern software development, so let's take you through how to get started with it.

"Functional vs non-functional testing" with a simplified version of the Mailosaur UI on the right

Best practices

Functional vs non-functional: Which should I use for email testing?

Functional testing makes sure the information input into the system outputs the correct results, and non-functional testing covers parameters that functional testing doesn’t, like security, reliability, and performance.

Best practices

How to write and test alt text for emails in 2026

Boost email accessibility, rendering consistency, and engagement by implementing better alt text strategies.

"The structure of an email" with an annotated email to the right showing labels such as "email address" and "personalised name"

Best practices

How modern emails are structured (and how to test them)

Understand the anatomy of a modern email, from headers to HTML, and how to reliably test them with a dedicated email testing tool like Mailosaur.

Abstract green background with email and mobile illustration with security icon

Best practices

The biggest hidden complication in email and SMS testing

Learn how to ensure privacy, data protection, and secure workflows with compliant test environments for QA and automation.

Abstract green background with test running dialog and pass and fail results

Best practices

Flaky email tests; the problem, causes and solutions

Don't let flaky tests impact your release times, drive-up maintenance costs, or impact your team morale.

Dark and light mode emails with Mailosaur and Mailtrap logos and running test dialogs

Mailosaur vs Competitors

The ultimate email testing tool: comparing Mailosaur and Mailtrap

Wondering which email testing tool is best for your team? Check out a real side by side comparison and make an informed choice.

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