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MailSlurp

mailslurp.com

From $19.99/mo Free plan WebiOSAndroidAPI
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Spec score 8.9 #5 of 28 in Email Testing Software

What it is

MailSlurp provides tools to build, test, and automate email and SMS workflows. Users can create temporary or permanent inboxes and handle messages through APIs, SDKs, SMTP, IMAP, and webhooks. It supports end-to-end tests for scenarios including OTP, MFA, magic links, and load testing, as well as device previews, email audits, and inbox placement checks. Pipelines can route messages and attachments using webhooks, forwarding, and automatic replies. AI extraction can turn emails and attachments such as PDFs and images into structured JSON using prompts, schemas, and OCR. Listed integrations include Playwright, Cypress, Selenium, HubSpot, Braze, Mailchimp, Zapier, and AI assistants through MCP. A REST API and official SDKs cover several programming languages. The free plan has capped allowances, including 500 received emails and 1,000 sandbox sends per month. Starter costs $19.99/mo; custom domains and phone numbers require Pro on Free and Starter plans. MailSlurp is web- and API-accessible.

Spec sheet

What it does
MailSlurp provides programmable email addresses, phone numbers, messaging APIs and testing workflows for developers and QA teams.Read 15 Oct 2026 · mailslurp.com
Product
MailSlurp provides tools to build, test, and automate email and SMS workflows.Read 29 Sep 2026 · mailslurp.com
Integrations
The integrations directory lists 79 items, including SDKs, Playwright, Cypress, Selenium, BrowserStack, Zapier, Power Automate, UiPath, Postman, GraphQL and webhooks.Read 15 Oct 2026 · mailslurp.com
Security
The security policy says data at rest is encrypted with AES-256, data in transit uses TLS/SSL, and daily backups are stored in AWS S3.Read 29 Sep 2026 · mailslurp.com
Compliance
MailSlurp states GDPR compliance, AWS data-center ISO 27001 and SOC 2 standards, PCI DSS payment handling through Stripe, OWASP practices and NIST framework alignment.Read 15 Oct 2026 · mailslurp.com
Support
The support page offers guides and direct contact for account, billing, delivery, and technical issues.Read 29 Sep 2026 · mailslurp.com
Headquarters
Saue, Harjumaa, EstoniaRead 28 Sep 2026 · mailslurp.com
Company
MailSlurp identifies PettmanOU as its legal entity and lists its address in Saue, Estonia.Read 29 Sep 2026 · mailslurp.com
AI extraction
AI transforms can convert email, attachment and SMS content into structured data and automated results.Read 15 Oct 2026 · mailslurp.com
Application testing
The service supports end-to-end email and SMS tests, including OTP, MFA, magic-link, and load testing workflows.Read 29 Sep 2026 · mailslurp.com
Authentication
API requests use an x-api-key header or apiKey query parameter, with header authentication recommended.Read 15 Oct 2026 · mailslurp.com
Automation
Webhooks, filtering rules, forwarding, automatic replies and attachment automations route and process messages.Read 15 Oct 2026 · app.mailslurp.com
Company database facts
Crunchbase lists Pettman OU as an active for-profit company in Tallinn with 1–10 employees and founder Jack Mahoney.Read 15 Oct 2026 · crunchbase.com
Company legal name
The legal entity is Pettman OÜ, registered at Rännaku pst 12, Tallinn, Estonia.Read 15 Oct 2026 · mailslurp.com
Company profile
LinkedIn lists MailSlurp as a public IT services company founded in 2018 with 2–10 employees.Read 15 Oct 2026 · linkedin.com
Current status
The opened status page showed HTTP 200 checks for the API, email processes, website, dashboard, federated login, IMAP, SMTP and enterprise login.Read 15 Oct 2026 · status.mailslurp.com
Developer access
MailSlurp offers a REST API and official SDKs for languages including JavaScript, Python, Java, C#, PHP, Go, Ruby, and TypeScript.Read 29 Sep 2026 · mailslurp.com
Device rendering
The platform renders delivered email on targets such as Gmail web, Android, Apple Mail on iPhone/iPad/Mac and Outlook desktop.Read 15 Oct 2026 · app.mailslurp.com
Email quality
MailSlurp offers device previews, email audits, and inbox placement tests across supported mail clients and providers.Read 29 Sep 2026 · mailslurp.com
Email quality audits
Email Audit checks links, images, authentication posture and message quality.Read 15 Oct 2026 · mailslurp.com
Email testing
MailSlurp supports end-to-end tests for email, SMS, OTP and magic-link workflows with Playwright, Cypress, Selenium and backend tests.Read 15 Oct 2026 · mailslurp.com
External mailbox connectors
Connectors synchronize Gmail, Outlook/Exchange and custom IMAP or SMTP mailboxes into MailSlurp workflows.Read 15 Oct 2026 · mailslurp.com
Funding
Crunchbase shows no disclosed MailSlurp funding amount or completed funding round in the opened company profile.Read 15 Oct 2026 · crunchbase.com
Hosting
The security policy states that MailSlurp is hosted on AWS in the us-west-2 region in Oregon, USA.Read 29 Sep 2026 · mailslurp.com
Hosting region
The security policy says MailSlurp is hosted in AWS us-west-2 in Oregon, USA.Read 15 Oct 2026 · mailslurp.com
Inbox placement
Inbox-placement tests compare delivery across personal and business Gmail and Microsoft mailboxes.Read 15 Oct 2026 · app.mailslurp.com
Licence
The hosted MailSlurp service is proprietary, while public official SDK repositories such as the TypeScript client are MIT licensed.Read 15 Oct 2026 · github.com
Limit: account and billing handling
Trustpilot complaints repeatedly mention frozen or closed accounts, unexpected plan charges, refund disputes and rude or slow support responses.Read 15 Oct 2026 · trustpilot.com
Limit: price and support
G2 reviewers complained about high cost, limited promotions, invoice/account problems and difficulty reaching customer service.Read 15 Oct 2026 · g2.com
Plan limits
Free and Starter plans cap email, inbox, storage, and testing allowances; custom domains and phone numbers require Pro on those plans.Read 29 Sep 2026 · app.mailslurp.com
Praise: ease of testing
Trustpilot reviewers repeatedly described MailSlurp as straightforward, quick and useful for testing email and SMS, with some praising helpful support.Read 15 Oct 2026 · trustpilot.com
Praise: functionality
A G2 reviewer said the tool was simple, effective and delivered what was promised; another said templates and functionality saved substantial time.Read 15 Oct 2026 · g2.com
Programmable inboxes
Users can create permanent or disposable inboxes, send and receive messages, and inspect message content, headers, links and attachments.Read 15 Oct 2026 · mailslurp.com
Protocol access
MailSlurp supports SMTP and IMAP connections, including credentials and documented server hosts and ports.Read 15 Oct 2026 · mailslurp.com
Rating on G2
2.0 out of 5 from 2 reviewsRead 15 Oct 2026 · g2.com
Rating on GetApp
0 out of 5 from 0 reviewsRead 15 Oct 2026 · getapp.com
Rating on Trustpilot
3.1 out of 5 from 15 reviewsRead 15 Oct 2026 · trustpilot.com
Rating on TrustRadius
0 out of 10 from 0 reviews and ratingsRead 15 Oct 2026 · trustradius.com
REST API
The API reference exposes 847 endpoints and 814 schemas, with OpenAPI, Swagger UI, Postman and SDK entry points.Read 15 Oct 2026 · mailslurp.com
SDK coverage
Official clients and libraries are listed for JavaScript, TypeScript, Python, Java, C#, PHP, Go, Ruby, Rust, Swift, Kotlin, Dart, C++ and many other languages.Read 15 Oct 2026 · mailslurp.com
Security controls
The security policy states TLS in transit, AES-256 encryption at rest, AWS RDS/S3 storage, daily backups, VPNs, network ACLs, penetration testing and RBAC.Read 15 Oct 2026 · mailslurp.com
Self-hosting
MailSlurp describes itself as cloud-hosted SaaS running on AWS rather than as a self-hosted product.Read 15 Oct 2026 · mailslurp.com
SMS and phone numbers
The service provisions phone numbers and lets code receive SMS verification messages and OTPs.Read 15 Oct 2026 · mailslurp.com
Support resources
The support center lists 28 guides covering access, billing, delivery, SMTP errors, timeouts, refunds and account troubleshooting.Read 15 Oct 2026 · mailslurp.com

Plans and prices

Free Free forever 500 emails received/month · 1,000 sandbox sends/month · 1 device render/month · 1 inbox placement test/month · 100 inbox creations/month · 50 retained inboxes · 200 MB storage Read 29 Sep 2026 · app.mailslurp.com
Free Free $0 forever 1 agent · 50 retained inboxes · 100 inbox creations/month · 500 inbound emails/month · 1,000 sandbox sends/month · 3 device renders/month · 3 inbox-placement tests/month Read 15 Oct 2026 · app.mailslurp.com
Starter $19.99 a month $19.99 per month 1 user · 100 retained inboxes · 250 inbox creations/month · 1,000 inbound + 100 testing sends/month · 5 device renders/month · 3 placement tests/month · 500 MB storage Read 15 Oct 2026 · app.mailslurp.com
Starter $19.99 a month per month 1,000 emails received/month · 100 test sends/month · 5 device renders/month · 3 inbox placement tests/month · 250 inbox creations/month · 100 retained inboxes · 500 MB storage · 50 sends/day Read 29 Sep 2026 · app.mailslurp.com
Pro $49.99 a month per month 5,000 emails received/month · 500 external sends/month · 10 device renders/month · 10 inbox placement tests/month · 1 warm-up sender · 1,000 inbox creations/month · 1 GB storage · up to 5 phone number rentals Read 29 Sep 2026 · app.mailslurp.com
Pro $49.99 a month $49.99 per month 3 agents · 1,000 inbox creations/month then $3 per 1,000 · 5,000 inbound + 500 external sends/month · 10 device renders then $0.50 each · 10 placement tests then $1 each · 1 GB storage Read 15 Oct 2026 · app.mailslurp.com
Growth $129.99 a month $129.99 per month 10 agents · 5,000 inbox creations/month then $3 per 1,000 · 5,000 inbound emails then $0.99 per 1,000 · 500 external sends then $0.99 per 1,000 · 2 users · 1 domain · 5 GB storage Read 15 Oct 2026 · app.mailslurp.com
Growth $129.99 a month per month 5,000 emails received/month · 500 external sends/month · 200 device renders/month · 100 inbox placement tests/month · 3 warm-up senders · 5,000 inbox creations/month · 5 GB storage · up to 35 phone number rentals · 2 users included Read 29 Sep 2026 · app.mailslurp.com
Enterprise Priced on request Custom plans SAML/OIDC SSO · SCIM · roles and permissions · audit logs · environments · regional hosting · SOC 2, GDPR and CCPA compliance · custom MSA Read 15 Oct 2026 · app.mailslurp.com

Every MailSlurp plan and price →

Strong points and limits

Strong points

  • Supports end-to-end email and SMS testing.
  • Tests include OTP, MFA, and magic-link workflows.
  • AI extraction produces structured JSON from emails and attachments.
  • Offers a REST API and multiple official SDKs.
  • Free plan is available.

Limits

  • Free plan caps email, inbox, storage, and testing allowances.
  • Custom domains and phone numbers require Pro on Free and Starter.
  • Starter costs $19.99/mo.

Who it suits

MailSlurp suits developers building or testing email and SMS flows, and teams that need inbox or delivery checks. Its APIs, SDKs, testing tools, and automation may fit application-development workflows.

Verdict

MailSlurp brings programmable inboxes, workflow automation, message testing, and email-quality checks together. Check plan caps and the Pro requirement for custom domains or phone numbers before relying on those capabilities.

Where Specifiction places it

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