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MailSlurp
Saue, Harjumaa, Estonia
What it is
MailSlurp provides tools for building, testing, and automating email and SMS workflows through the web and an API. Users can create temporary or permanent inboxes and send, receive, and inspect messages through APIs, SDKs, SMTP, IMAP, and webhooks. Testing covers end-to-end scenarios such as OTP, MFA, magic links, and load testing. MailSlurp also offers device previews, email audits, and inbox placement tests across supported clients and providers. Pipelines can route messages and attachments through webhooks, forwarding, and automatic replies. AI extraction turns emails and attachments, including PDFs and images, into structured JSON using prompts, schemas, and OCR. Integrations include Playwright, Cypress, Selenium, HubSpot, Braze, Mailchimp, Zapier, and AI assistants through MCP. A REST API and official SDKs are available for several programming languages. The free plan includes 500 emails received and 1,000 sandbox sends per month, plus other capped allowances. Starter costs $19.99 a month. Custom domains and phone numbers require Pro on Free and Starter plans.
For and against
For
- Supports inboxes accessed through APIs, SDKs, SMTP, and IMAP.
- Tests OTP, MFA, magic-link, and load workflows.
- AI extraction can structure email and attachment data as JSON.
- Lists integrations with Playwright, Cypress, and Selenium.
Against
- Free plan caps email, inbox, storage, and testing allowances.
- Custom domains and phone numbers require Pro on Free and Starter.
- Starter costs $19.99 a month.
The verdict
MailSlurp combines programmable inboxes, workflow automation, and email and SMS testing. Its free plan has defined monthly limits, while custom domains and phone numbers are reserved for Pro or higher.
Who it suits
MailSlurp may suit developers building or testing email and SMS flows, and teams that need inbox or email-quality checks. Its API, SDKs, and listed testing integrations support developer workflows.
Plans and prices
Free
1 agent · 50 retained inboxes · 100 inbox creations/month · 500 inbound emails/month
Read 15 Oct 2026 · app.mailslurp.com
Starter
1 user · 100 retained inboxes · 250 inbox creations/month · 1,000 inbound + 100 testing sends/month
Read 15 Oct 2026 · app.mailslurp.com
Pro
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
Read 15 Oct 2026 · app.mailslurp.com
Growth
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
Read 15 Oct 2026 · app.mailslurp.com
Enterprise
SAML/OIDC SSO · SCIM · roles and permissions · audit logs
Read 15 Oct 2026 · app.mailslurp.com
On the record
- AI extraction
- AI transforms can convert email, attachment and SMS content into structured data and automated results.mailslurp.com · read 15 Oct 2026
- Application testing
- The service supports end-to-end email and SMS tests, including OTP, MFA, magic-link, and load testing workflows.mailslurp.com · read 29 Sep 2026
- Authentication
- API requests use an x-api-key header or apiKey query parameter, with header authentication recommended.mailslurp.com · read 15 Oct 2026
- Automation
- Webhooks, filtering rules, forwarding, automatic replies and attachment automations route and process messages.app.mailslurp.com · read 15 Oct 2026
- Company
- MailSlurp identifies PettmanOU as its legal entity and lists its address in Saue, Estonia.mailslurp.com · read 29 Sep 2026
- Company database facts
- Crunchbase lists Pettman OU as an active for-profit company in Tallinn with 1–10 employees and founder Jack Mahoney.crunchbase.com · read 15 Oct 2026
- Company legal name
- The legal entity is Pettman OÜ, registered at Rännaku pst 12, Tallinn, Estonia.mailslurp.com · read 15 Oct 2026
- Company profile
- LinkedIn lists MailSlurp as a public IT services company founded in 2018 with 2–10 employees.linkedin.com · read 15 Oct 2026
- 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.mailslurp.com · read 15 Oct 2026
- Current status
- The opened status page showed HTTP 200 checks for the API, email processes, website, dashboard, federated login, IMAP, SMTP and enterprise login.status.mailslurp.com · read 15 Oct 2026
- Developer access
- MailSlurp offers a REST API and official SDKs for languages including JavaScript, Python, Java, C#, PHP, Go, Ruby, and TypeScript.mailslurp.com · read 29 Sep 2026
- Device rendering
- The platform renders delivered email on targets such as Gmail web, Android, Apple Mail on iPhone/iPad/Mac and Outlook desktop.app.mailslurp.com · read 15 Oct 2026
- Email quality
- MailSlurp offers device previews, email audits, and inbox placement tests across supported mail clients and providers.mailslurp.com · read 29 Sep 2026
- Email quality audits
- Email Audit checks links, images, authentication posture and message quality.mailslurp.com · read 15 Oct 2026
- Email testing
- MailSlurp supports end-to-end tests for email, SMS, OTP and magic-link workflows with Playwright, Cypress, Selenium and backend tests.mailslurp.com · read 15 Oct 2026
- External mailbox connectors
- Connectors synchronize Gmail, Outlook/Exchange and custom IMAP or SMTP mailboxes into MailSlurp workflows.mailslurp.com · read 15 Oct 2026
- Funding
- Crunchbase shows no disclosed MailSlurp funding amount or completed funding round in the opened company profile.crunchbase.com · read 15 Oct 2026
- Hosting
- The security policy states that MailSlurp is hosted on AWS in the us-west-2 region in Oregon, USA.mailslurp.com · read 29 Sep 2026
