Mailosaur
Platform for automated email and SMS testing with integrated message previews and test automation support
- Vendor
- Mailosaur Ltd
- Also known as
- mailosaur
Available worldwide · Popular in: GB, US
What is Mailosaur?
Mailosaur enables development and QA teams to test emails and SMS messages end-to-end with real-device message previews across email clients and devices. The platform supports test automation through APIs and integrations with popular testing frameworks, eliminating the need for dummy accounts or manual testing.
Mailosaur pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
From $20/month billed annually. 14-day free trial available.
Personal
Email testing essentials for individual developers
- inboxes
- 1
- users_supported
- 3
- emails_per_month
- 15000
- Unlimited email addresses per inbox
- Email compatibility testing
- API for test automation
- Email forwarding to external addresses
Core
Collaborative email testing for teams
- seats_included
- 5
- emails_per_month
- 75000
- Multiple inboxes with unlimited email addresses
- Team access and collaboration
- Email accessibility testing
- Email forwarding and reply functionality
- POP3 and IMAP connectivity
- Mail rules and auto-forwarding
Enterprise
Contact salesCustom solution for large organizations
- Custom user and inbox configuration
- Team and project-level permission separation
- Single Sign-On (SAML2 and OIDC)
- Enterprise security features (SCIM, custom session timeouts)
- Dedicated account manager
- Advanced support with SLAs
- Custom contract terms
- International phone number support
Add-ons
- SMS and authentication$37.50/mo
- Email previews$25/mo
What Mailosaur does
The capabilities that matter for email testing dev, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- API assertions
- ✓
- Rendering preview
- ✓
- Spam score check
- ✓
- Blocklist deliverability check
- -
- SMS testing
- ✓
- Production sending addon
- ✓
- Ci cd integration
- ✓
- Multi user inboxes
- ✓
- Open source
- ✗
Platform & deployment
Independently observed- Web
- Cloud / SaaS
Integrations (21)
Independently observed- Selenium
- Playwright
- Cypress
- TestCafe
- WebdriverIO
- Cucumber
- Robot Framework
- Ghost Inspector
- Postman
- Insomnia
- PowerShell
- Node.js
- Java
- Python
- Ruby
- .NET
- PHP
- Go
- JavaScript
- Okta
- Microsoft Entra
Security & compliance
Independently observed- ISO 27001:2022 · 2022active
Mailosaur FAQ
Common questions about Mailosaur, answered from independent, dated evidence.
What is Mailosaur?
A testing service that validates email and SMS messages for accessibility standards compliance, rendering consistency across email clients, and delivery quality, with API and SDK support for automated testing. It is indexed under Email Testing Dev.
Source: https://mailosaur.com
How much does Mailosaur cost?
Mailosaur is a paid product; published pricing starts at $20 per month. It is sold across 3 plans (Personal, Core and Enterprise). There is no free tier. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.
Source: https://mailosaur.com/pricing
What platforms does Mailosaur support?
Mailosaur supports the web and iOS. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://mailosaur.com
Can Mailosaur be self-hosted?
We have only confirmed a cloud / SaaS deployment for Mailosaur, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.
Source: https://mailosaur.com
What does Mailosaur integrate with?
We have confirmed 20 integrations for Mailosaur, including Selenium, Playwright, Cypress, TestCafe, WebdriverIO, Cucumber, Robot Framework and Ghost Inspector, plus 12 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.
Source: https://mailosaur.com
What security certifications does Mailosaur have?
We have independently confirmed ISO 27001 and GDPR for Mailosaur. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Mailosaur not holding them. Always confirm compliance directly before you rely on it.
Where is Mailosaur available?
Mailosaur is available worldwide. Its primary markets are the United Kingdom and the United States. The vendor is headquartered in the United Kingdom.
Source: https://mailosaur.com/pricing
Mailosaur alternatives
Other email testing dev we track, ranked by the same independent score.
- Testmail.appAPI-based email testing platform for automated QA and CI/CD workflowslow · 45%
- Email on AcidEmail testing and validation platform for pre-send campaign quality assurancemedium · 64%
- GreenMailAn open source sandbox for testing email server protocols without sending actual emailslow · 31%
- MailSlurpEmail and SMS testing and automation platform with API and dashboard accessmedium · 54%
- MaildevDevelopment email testing utility with SMTP server and web dashboardlow · 35%
- Mailpitlow · 29%
Compare Mailosaur
Side by side against other email testing dev, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Mailosaur, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Pricing transparency | 100 | 0.05 | 5.3 | ✓ |
| Security posture | 50 | 0.09 | 4.4 | ✓ |
| Capabilities | 87 | 0.03 | 2.8 | ✓ |
| Price level | 50 | 0.04 | 2.0 | ✓ |
| Integrations | 33 | 0.04 | 1.2 | ✓ |
| Reliability | 0 | 0.05 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 7 items | mediumsource · 2026-09-10 · 64% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Sms testing, Api assertions, Spam score check, Ci cd integration, Rendering preview, Multi user inboxes, Production sending addon | mediumsource · 2026-10-12 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 13 | mediumsource · 2026-10-12 · 60% |
Market
| Attribute | Value | Evidence |
|---|---|---|
| Availability | HqCountry: GB · PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: … | highsource · 2026-10-12 · 75% |
Pricing
Security
| Attribute | Value | Evidence |
|---|---|---|
| Disclosure policy | Yes | mediumsource · 2026-10-12 · 60% |
| Gdpr | Yes | highsource · 2026-10-12 · 75% |
| Iso27001 | Yes | highsource · 2026-10-12 · 75% |
| Pci | Yes | highsource · 2026-10-12 · 75% |
| Trust center | https://mailosaur.com/security | mediumsource · 2026-10-12 · 60% |
| Certifications | ISO 27001:2022 | mediumsource · 2026-10-12 · 60% |
Is Mailosaur the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank Mailosaur against the rest of the email testing dev we index, using the same dated evidence weighted your way.
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