Mailosaur

Review of Mailosaur Software: system overview, features, price and cost information. Get free demos and compare to similar programs.

Overview

About Mailosaur

Mailosaur is an API-based testing platform designed for developers and quality assurance teams to test email, SMS, and user actions within applications. It is used across industries such as finance, healthcare, retail, and travel by engineering teams, quality assurance professionals, product managers, and marketing departments. The platform provides virtual SMTP servers, enabling businesses to capture outgoing emails from applications. Features include email and SMS testing, email previews across various clients, automated rules for simulating scenarios, message analysis tools, and multi-factor authentication testing. It allows teams to use custom domains with unlimited recognizable email addresses and ensure enterprise-level security through single sign-on. Mailosaur supports multiple programming languages, including JavaScript, Python, C#, Java, and Ruby. It is compatible with testing frameworks such as Cypress, Playwright, and Selenium. The platform adheres to security standards, holding ISO 27001 certification and complying with regulations such as GDPR, DORA, and CCPA to ensure data protection during testing.

Mailosaur Screenshots

Mailosaur Features

Features of Mailosaur
API
Collaboration Tools
Customizable Reports
Hierarchical View
Model-Based Testing
Monitoring
Reporting & Statistics
Requirements Management
Software Testing Management
Supports Parallel Execution

Mailosaur Integrations

Postman logo
Postman
Ghost Inspector logo
Ghost Inspector

Customer Reviews

See why people love Mailosaur

5 Star
80%
4 Star
20%
3 Star
0%
2 Star
0%
1 Star
0%
Nathan G.

Nathan G.

Verified User

Computer Software · 11-50 employees

Used daily for less than 12 months
Dec 22, 2025

Easy to use and very flexible

Great solution for our automated test suite to both handle real SMS and email testing programatically.

What they liked
  • Provided a lot of options on how to use it at a very cost effective price point
Room for improvement
  • Some of the docs where not super clear on how to interact with it via the API
Switched From

No programatic way to interact with Google was the primary reason.

Wojcieh H.

Verified User

Construction · 11-50 employees

Used daily for less than 12 months
Dec 22, 2025

Ease of use and great customer support.

Verified reviewer

What they liked
  • Ease of use and great communication with customer support
Room for improvement

Testing SendGrid emails was quite unstable but they managed to fix this after some time

Switched From

I wanted a solution that will be easier to maintain.

Verified Professional

Computer & Network Security · 51-200 employees

Used weekly for less than 6 months
Dec 22, 2025

Great product for automation testing

I’m a very happy customer. 10/10 would recommend.

What they liked
  • Ease of use for setting up extra emails and SMS
Room for improvement
  • Hmmm tough question
  • The UI is great and I feel there is little to improve upon

Verified Professional

Retail · 1001-5000 employees

Used daily for more than 2 years
Dec 22, 2025

Best Product with features and secure

Good product to use for automate your emails

What they liked
  • It's easy setup and you can customize the functionality for 20 scrum teams
Room for improvement

Phone Numbers support for SMS within The Netherlands , you cannot get a mobile number

Why they chose it

"better functionality and secure, the enterprise plan is very comprehensive"

Ryan S.

Verified User

Computer Software · 51-200 employees

Used daily for more than 2 years
Dec 22, 2025

Mailosaur for test automation

Good, I think the service we pay for and use with email is great and very reliable, we have not experienced any failures due to Mailosaur. I would like some cheaper ways to use their SMS services.

What they liked
  • We picked up Mailosaur as an off-the-shelf way to test our email flow
  • A lot of our automation that deals with email relies on it
  • The setup for validating links inside of the emails was very easy to work with in the Mailosar API, something I was looking for in a tool like this
Room for improvement
  • We would love to use SMS features, but the pricing is more than we are willing to commit to currently
  • Also not a fan of per-user pricing on a tool like this where the volume is also priced
  • We have limited seats
Why they chose it

"We considered setting up our own bespoke SMTP client or using Gmail, but both routes would've taken significant time compared to using this tool. This really is a dead simple tool for doing email test validation."

Alexander L.

Verified User

Information Services · 51-200 employees

Used monthly for less than 6 months
May 28, 2026

Easy to use and works well

It works well for our needs. We need to enter real email addresses in our tests to not be blocked from sending because of too high of a bounce rate. We also need to test that the email, Authenticator and sms related features in our product work well.

What they liked
  • It is easy to set up and works well
  • Provides APIs to easily use it in your end to end tests
Room for improvement
  • Don't really know
  • Haven't tried any competing products
  • I guess it could be cheaper or more seats be available in each tier

Devadasan K.

Verified User

Information Technology and Services · 10000+ employees

Used daily for more than 2 years
May 28, 2026

Simple and reliable product

Verified reviewer

What they liked
  • Pretty easy to setup and use
  • Support is readily available
  • When there was an issue is recovered, Mailosaur team was able to rollout the fix in 2 days
  • Thats amazing
Room for improvement
  • Nothing much that I can think about at this point

Lee W.

Verified User

Insurance · 5001-10000 employees

Used daily for more than 2 years
May 28, 2026

Powerful tool for Automated testing of Emails and SMS

Very positive, if I were to change company and they didn't have a Mailosaur license I would push to get one.

What they liked
  • 1- Excellent customer support, they are very knowledgeable about their tool, every time I have ended conversations with Mailosaur support I have ended it with the solution to my problem
  • Customer support are very patient and respectable towards their customers
  • 2 - The API integration for the Mailosaur tool has a lot of great functionality and supports multiple languages Java, Python, C#, Ruby and Node
  • js
  • I have only used the Java API so that is all I can speak to, it's very reliable
  • 3 - It's nice to have a front end view into the Virtual mailboxes, it really helps debug defects
Room for improvement
  • There is usage limits based on the license price
  • It's completely understandable and very fixable, if the company I work for wants more Mailosaur resources, pay more money
  • The price you pay for Mailosaur depends on how you configure the below limitations
  • I really don't have any complaints about Mailsoaur so wanted to use this field to provide useful information
  • The usage limits currently apply to: Number of emails sent per day
  • Number of SMS messages sent per month
  • Number of phone numbers assignable
  • Number of registered users

Caroline C.

Verified User

Computer Software · 2-10 employees

Used weekly for less than 2 years
May 28, 2026

Sensational Product

Verified reviewer

What they liked
  • We've absolutely loved using Mailosaur
  • Our automated testing is a breeze with Mailosaur and I use for manual QA as well
  • The emails show up incredibly fast and it seamlessly integrates with Cypress
  • I recommend them unreservedly
Room for improvement
  • Honestly so far I haven't found a downside
  • We've been using it for over a year and our QA team has said it's the best email for automated testing they've worked with

Matt N.

Verified User

Financial Services · 1001-5000 employees

Used daily for more than 2 years
May 28, 2026

A brilliant service that we couldn't be without

The thing that impressed me most at first was the level of personalised support that we received from Andy. There was a minor issue with a function that was corrected almost overnight. Mailosaur has helped us scale our testing for our Dashboard product from it's formative stages to the critical application that it's become for our customers.

What they liked

It was very easy to configure with Cypress and it provides us with demo users for presentations and manual testing

Room for improvement
  • I really can't think of anything
  • Its never failed us
  • I've never received strange errors and the service is always up
Why they chose it

"Someone recommended it from their previous company"

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Mailosaur

Mailosaur

4.8
Pricing
Pricing available upon request
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