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

Start for free Sign in Request a demo

Blog

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

Best practices

The ultimate guide to SMS testing

From manual checks to fully automated workflows, here’s how to test SMS with confidence.

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.

Best practices

Top tips for email testing in CI/CD pipelines

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

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.

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.

Playwright

Automate email verification testing in Playwright (links + OTPs)

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

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?

"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.

Mobile and email graphic with mobile, desktop, MacOS and dark mode dialog boxes on a gradient background

Mailosaur vs Competitors

Email preview software: the best Litmus alternatives

Let's talk email previews software; which is the best fit for your team?

iPhone illustration with email client logos and iPhone dialog box

News

How will your emails look on Apple’s iPhone 17?

Mailosaur offers coverage for the brand new iPhone 17, iPhone 17 Air and iPhone 17 Pro Max, allowing you to preview your emails across the board.

Best practices

How you know when you need to automate your QA tests

It’s a question that has beguiled an endless list of QA teams: should I automate this test?

Software development

Why emails look so different in different clients?

Email inconsistency across different clients and devices is a common source of frustration for both senders and recipients. This inconsistency can manifest in several ways, leading to emails not appearing in the inbox, content not fully loading, or images not displaying.

...