Hosted inboxes, connected providers, and custom domains
Use hosted MailSlurp addresses, connect Gmail or Outlook, or create inboxes and aliases on domains you control.
The Mailgun alternative for programmable inboxes and email testing
Create real inboxes, send and receive email from code, test OTP and transactional journeys, and add rendering, deliverability, and content checks without piecing together separate tools.
Trusted by developers, QA teams, and email teams worldwide
Build tests with inboxes you can control from code
Provision real email addresses for applications, test runs, agents, and support workflows. Send messages, wait for received email, inspect links and attachments, and keep every inbox tied to the workflow that created it.
Send, receive, and wait from code
Use REST APIs and official SDKs to send messages, wait for matching email, and inspect headers, links, codes, and attachments.
Route inbound email anywhere
Connect received messages to webhooks, applications, AI agents, databases, support tools, and automated pipelines.
Connect rendering and deliverability to the message that arrived
Use one received email to review supported client and device previews, inspect content and links, check inbox placement, and monitor the sender domain. This keeps visual QA and delivery evidence beside the application or campaign workflow under test.
Preview real client and device contexts
Compare supported Gmail, Outlook, Apple Mail, mobile, desktop, light mode, and dark mode renders before launch.
Measure inbox placement
See whether seeded email reaches inbox, promotions, or spam across major provider mailboxes before important sends.
Audit the delivered content
Find broken links, missing images, unsupported markup, and content warnings in the exact message your system produced.
Test the complete customer journey
Create the email and SMS infrastructure a test needs, trigger the real application flow, and assert the message and verified outcome before release.
OTP and MFA journeys
Receive real email or SMS codes and complete signup, login, recovery, and step-up authentication checks.
Testing framework integrations
Use MailSlurp with Playwright, Cypress, Selenium, Postman, Java, Python, JavaScript, and existing test runners.
CI/CD release gates
Run deterministic email and SMS checks on pull requests and stop a release when a critical customer flow fails.
Parallel and load testing
Provision isolated inbox cohorts, increase concurrency, and measure receipt timing without shared-account collisions.
Bring email QA into the same workflow
Pair programmable inboxes with the checks that reveal customer-visible rendering, placement, sender, and content problems.
Device previews
Preview a delivered email across supported mailbox clients, devices, and light and dark mode contexts.
Inbox placement tests
Check inbox, promotions, and spam outcomes against major provider mailboxes before increasing send volume.
Sender health monitoring
Track SPF, DKIM, DMARC, MX, blocklists, reputation signals, and domain changes alongside test results.
Email content audits
Inspect links, images, HTML, CSS, headers, and message content before a campaign or product email goes live.
Use one platform for inboxes, testing, and email QA
Create programmable inboxes and phone numbers, test email and SMS, preview messages across clients, measure placement, and automate the checks that protect customer journeys.
Email and SMS together
Create email addresses and phone numbers from the same API for cross-channel OTP, MFA, recovery, and notification tests.
Inbound webhooks and routing
Route new-email events and parsed content into applications, test harnesses, agents, databases, and support systems.
Team and enterprise controls
Support production workflows with team permissions, account controls, custom domains, and enterprise security options.
Flexible plans for your team
Choose a package that covers the inbox, preview, automation, team, and support usage you need.
Frequently asked questions
See how MailSlurp supports inbox APIs, SMTP and IMAP access, reliable migration, and flexible pricing.
How is MailSlurp different from Mailgun?
Mailgun provides broad sending and deliverability products. MailSlurp is focused on programmable inboxes, email and SMS testing, received-message assertions, real-client previews, inbox placement, sender monitoring, and automation for QA, applications, and agents. Discuss a tailored package
Does MailSlurp support SMTP, IMAP, and inbound email APIs?
Yes. MailSlurp provides programmable inboxes with API access plus SMTP and IMAP options for compatible workflows. You can receive email, search messages, download attachments, extract links or codes, and route new-message events through webhooks. Explore the inbound email API Read the SMTP API guide
Can I migrate a Mailgun testing workflow to MailSlurp?
Yes. Start with one workflow such as signup, OTP, password reset, billing, or inbound routing. Replace the test inbox and wait logic first, verify the received-message assertions, then add rendering, placement, sender, or content checks where the release needs more evidence. See Mailgun email testing guidance
Is MailSlurp reliable for CI and parallel test runs?
MailSlurp lets each test create an isolated inbox and wait deterministically for a matching message, which avoids shared-mailbox collisions and fixed sleep timers. Service availability is published on the status page, and enterprise plans can include documented support and availability commitments. View service status Review the MailSlurp SLA
Is MailSlurp pricing flexible for teams moving from Mailgun?
Yes. MailSlurp can shape a package around messages, inboxes, phone numbers, preview demand, automation, placement, monitoring, team access, support, and enterprise requirements. Share your Mailgun invoice or Inspect quote and we will tailor the package to the services your team uses. Request a tailored package
Run your first MailSlurp email test
Create an inbox, send a real application email, verify the delivered message, and add client previews or inbox-placement checks when you need them.
