# Email verifier for signup, import, and pre-send decisions Use MailSlurp as an email verifier and verification API to classify syntax, MX, disposable, role, catch-all, and workflow risk before important messages go out. Treat email verification as a workflow control. MailSlurp helps teams classify address quality, route uncertain records into review, and connect recipient checks to inbox testing and sender-health evidence. [Start free](https://app.mailslurp.com/sign-up/?onboardingRequest=deliverability) [Open API guide](https://www.mailslurp.com/email-validation-api/) ![Email verifier workflow for signup, import, and pre-send checks](https://assets-cdn.mailslurp.com/image-variants/1920/mj/product-email-verification-hero.png?v=cc1d15fdde2aa20df0302c7fefb9b5ca50546a80) Trusted by top companies worldwide - ![Broadcom](https://www.mailslurp.com/assets/companies/broadcom.svg) - ![Scraper](https://www.mailslurp.com/assets/companies/scraper.svg) - ![Trivago](https://www.mailslurp.com/assets/companies/trivago.svg) - ![Avast](https://www.mailslurp.com/assets/companies/avast.svg) - ![Wolt](https://assets-cdn.mailslurp.com/image-variants/340/assets/companies/wolt.png?v=cc1d15fdde2aa20df0302c7fefb9b5ca50546a80) - ![Panasonic](https://www.mailslurp.com/assets/companies/panasonic.svg) ## Check syntax, MX, disposable, role, and catch-all risk before critical actions Use MailSlurp to check email addresses at signup, profile update, import, and pre-send checkpoints before bad records create bounced password resets, missed invoices, support cases, or sender-health problems. ![Email address verification and validation controls](https://assets-cdn.mailslurp.com/image-variants/1920/mj/product-email-verification-hero.png?v=cc1d15fdde2aa20df0302c7fefb9b5ca50546a80) ## Turn verifier results into pass, review, and reject decisions Protect sender reputation without over-blocking real users. MailSlurp helps teams apply stricter policy where address failure has higher product, billing, security, or campaign impact. ![Address quality and sender reliability workflow](https://assets-cdn.mailslurp.com/image-variants/1920/mj/product-reliability-platform-hero.png?v=cc1d15fdde2aa20df0302c7fefb9b5ca50546a80) ## Email verifier workflows MailSlurp supports Run recipient-quality checks where address risk changes product, CRM, support, lifecycle, and sender-health outcomes. ### Signup checks Validate addresses before account creation, activation, or profile updates with workflow-specific pass, review, and reject handling. [Open API guide](https://www.mailslurp.com/email-validation-api/) ### CRM imports Screen migration lists, partner uploads, and CRM imports for syntax, MX, disposable, role, and catch-all risk before they affect production sends. [Open verification guide](https://www.mailslurp.com/blog/email-verification-tools/) ### Pre-send validation Re-check stale or high-value contacts before campaigns, alerts, or lifecycle sends. [Open email checker](https://www.mailslurp.com/tools/email-checker/) ### Auth paths Use stricter checks when signup, password reset, OTP, or account recovery depends on a reachable recipient and a real inbox result. [Open integration testing](https://www.mailslurp.com/product/email-integration-testing/) ### Review queues Route uncertain records into review with reason codes so support, sales, and lifecycle teams can resolve edge cases without guessing. [Open verification tools](https://www.mailslurp.com/blog/email-verification-tools/) ### Sender health Pair address-quality decisions with DMARC, SPF, DKIM, inbox placement, and deliverability monitoring when sender posture is part of the risk. [Open monitoring](https://www.mailslurp.com/product/dmarc-spf-dkim-monitoring/) Integrate MailSlurp Seamlessly [![Javascript](https://www.mailslurp.com/icons/javascript.svg)](https://www.mailslurp.com/developers/) [![Python](https://www.mailslurp.com/icons/python.svg)](https://www.mailslurp.com/developers/) [![CSharp](https://www.mailslurp.com/icons/csharp.svg)](https://www.mailslurp.com/developers/) [![Java](https://www.mailslurp.com/icons/java.svg)](https://www.mailslurp.com/developers/) [![Postman](https://www.mailslurp.com/icons/postman.svg)](https://www.mailslurp.com/developers/) [![PHP](https://www.mailslurp.com/icons/php.svg)](https://www.mailslurp.com/developers/) [![Ruby](https://www.mailslurp.com/icons/ruby.svg)](https://www.mailslurp.com/developers/) [![Playwright](https://www.mailslurp.com/icons/playwright.svg)](https://www.mailslurp.com/developers/) [![Selenium](https://assets-cdn.mailslurp.com/image-variants/340/assets/brands/icons/selenium.png?v=cc1d15fdde2aa20df0302c7fefb9b5ca50546a80)](https://www.mailslurp.com/developers/) [![Javascript](https://www.mailslurp.com/icons/javascript.svg)](https://www.mailslurp.com/developers/) [![Python](https://www.mailslurp.com/icons/python.svg)](https://www.mailslurp.com/developers/) [![CSharp](https://www.mailslurp.com/icons/csharp.svg)](https://www.mailslurp.com/developers/) [![Java](https://www.mailslurp.com/icons/java.svg)](https://www.mailslurp.com/developers/) [![Postman](https://www.mailslurp.com/icons/postman.svg)](https://www.mailslurp.com/developers/) [![PHP](https://www.mailslurp.com/icons/php.svg)](https://www.mailslurp.com/developers/) [![Ruby](https://www.mailslurp.com/icons/ruby.svg)](https://www.mailslurp.com/developers/) [![Playwright](https://www.mailslurp.com/icons/playwright.svg)](https://www.mailslurp.com/developers/) [![Selenium](https://assets-cdn.mailslurp.com/image-variants/340/assets/brands/icons/selenium.png?v=cc1d15fdde2aa20df0302c7fefb9b5ca50546a80)](https://www.mailslurp.com/developers/) ### Integrate with any framework Official plugins and SDKs for all major programming languages, frameworks, and test platforms. All functionality available via API or dashboard. ![Flexible integration patterns](https://assets-cdn.mailslurp.com/image-variants/1024/assets/home/cicd.png?v=cc1d15fdde2aa20df0302c7fefb9b5ca50546a80) ### CI/CD Native MailSlurp fits right into your existing development, testing, and CI/CD workflows. Deploy and iterate with confidence and actionable feedback. [Developer Integrations](https://www.mailslurp.com/developers/) ## Video walkthrough [More on YouTube](https://www.youtube.com/@mailslurp) ### Verify an email address with SMTP VRFY ## Global messaging scale Emails processed 500 million+ Infrastructure that scales. Mobile networks 20+ Leverage global telecom networks. Mature platform 10+ years Stable and dependable.