MailSlurp

Free plan AndroidAPIiPhoneWeb

What MailSlurp is

MailSlurp provides tools to build, test, and automate email and SMS workflows. Users can create temporary or permanent inboxes and send, receive, and inspect messages through APIs, SDKs, SMTP, IMAP, and webhooks. Its end-to-end tests cover scenarios including 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 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. The service offers a REST API and official SDKs for several programming languages. The free plan includes 500 received emails and 1,000 sandbox sends per month, plus other capped allowances. Starter costs $19.99 per month; custom domains and phone numbers require Pro on Free and Starter plans.

Who it suits

MailSlurp suits developers building or testing email and SMS flows, including automated message tests and inbox workflows. Teams needing custom domains or phone numbers should factor in the plan requirement for Pro on Free and Starter.

What it does well

Supports APIs, SDKs, SMTP, IMAP, and webhooks.
Tests OTP, MFA, magic links, and load workflows.
AI extraction can structure email and attachment data as JSON.
Free plan includes 1,000 sandbox sends per month.

What to know first

Free and Starter plans cap several usage allowances.
Custom domains and phone numbers require Pro on Free and Starter.
Starter costs $19.99 per month.

Limits

The Free plan includes 500 received emails per month, 1,000 sandbox sends per month, 50 retained inboxes and 200 MB storage, among other caps. Starter includes 1,000 received emails per month, 100 test sends per month and 500 MB storage; custom domains and phone numbers require Pro on Free and Starter.

Plans

Plan	Billed and limits	Price
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	Free
Growth	$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	$129.99 a month
Starter	$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	$19.99 a month
Pro	$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	$49.99 a month
Enterprise	Custom plans · SAML/OIDC SSO · SCIM · roles and permissions · audit logs · environments · regional hosting · SOC 2, GDPR and CCPA compliance · custom MSA	On request

As mailslurp.com lists them, read 15 Oct 2026. The maker's own page has the final word.

Getting started

Visit the MailSlurp website.
Choose the Free plan or a paid plan starting with Starter at $19.99 a month.
Create temporary or permanent inboxes.
Connect through the API, an SDK, SMTP, IMAP or webhooks.
Use the available integrations or build tests for your email and SMS workflows.

Verdict

MailSlurp combines programmable inboxes, workflow automation, and email and SMS testing, with extraction and developer integrations. Compare its capped plan allowances with your expected volume before choosing a tier.

Questions

Is MailSlurp free?

Yes. The Free plan is billed forever at 0.00 USD and includes capped email, inbox, storage and testing allowances.

What does Starter cost?

Starter costs $19.99 a month, billed monthly.

Which platforms are available?

MailSlurp is listed for API and web platforms.

Can I use MailSlurp with an API or SDK?

Yes. It offers a REST API and official SDKs, as well as SMTP, IMAP and webhooks.

Which plans include custom domains and phone numbers?

Custom domains and phone numbers require Pro for users on Free and Starter plans.

Who is the company behind MailSlurp?

MailSlurp identifies PettmanOU as its legal entity and lists its address in Saue, Estonia.

Facts from MailSlurp's own pages

AI extraction: AI transforms can convert email, attachment and SMS content into structured data and automated results. · mailslurp.com, 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, 29 Sept 2026
Authentication: API requests use an x-api-key header or apiKey query parameter, with header authentication recommended. · mailslurp.com, 15 Oct 2026
Automation: Webhooks, filtering rules, forwarding, automatic replies and attachment automations route and process messages. · app.mailslurp.com, 15 Oct 2026
Company: MailSlurp identifies PettmanOU as its legal entity and lists its address in Saue, Estonia. · mailslurp.com, 29 Sept 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, 15 Oct 2026
Company legal name: The legal entity is Pettman OÜ, registered at Rännaku pst 12, Tallinn, Estonia. · mailslurp.com, 15 Oct 2026
Company profile: LinkedIn lists MailSlurp as a public IT services company founded in 2018 with 2–10 employees. · linkedin.com, 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, 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, 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, 29 Sept 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, 15 Oct 2026
Email quality: MailSlurp offers device previews, email audits, and inbox placement tests across supported mail clients and providers. · mailslurp.com, 29 Sept 2026
Email quality audits: Email Audit checks links, images, authentication posture and message quality. · mailslurp.com, 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, 15 Oct 2026
External mailbox connectors: Connectors synchronize Gmail, Outlook/Exchange and custom IMAP or SMTP mailboxes into MailSlurp workflows. · mailslurp.com, 15 Oct 2026
Funding: Crunchbase shows no disclosed MailSlurp funding amount or completed funding round in the opened company profile. · crunchbase.com, 15 Oct 2026
Headquarters: Saue, Harjumaa, Estonia · mailslurp.com, 28 Sept 2026
Hosting: The security policy states that MailSlurp is hosted on AWS in the us-west-2 region in Oregon, USA. · mailslurp.com, 29 Sept 2026
Hosting region: The security policy says MailSlurp is hosted in AWS us-west-2 in Oregon, USA. · mailslurp.com, 15 Oct 2026
Inbox placement: Inbox-placement tests compare delivery across personal and business Gmail and Microsoft mailboxes. · app.mailslurp.com, 15 Oct 2026
Integrations: The integrations directory lists 79 items, including SDKs, Playwright, Cypress, Selenium, BrowserStack, Zapier, Power Automate, UiPath, Postman, GraphQL and webhooks. · mailslurp.com, 15 Oct 2026
Licence: The hosted MailSlurp service is proprietary, while public official SDK repositories such as the TypeScript client are MIT licensed. · github.com, 15 Oct 2026
Limit: account and billing handling: Trustpilot complaints repeatedly mention frozen or closed accounts, unexpected plan charges, refund disputes and rude or slow support responses. · trustpilot.com, 15 Oct 2026

Where MailSlurp stands on Freedom251

Email Testing Software#10 of 28