New Playbook: Cold Email Infrastructure Setup Guide
Read Now arrow_forwardFake signups waste your onboarding resources and pollute your metrics. Mailsfinder's real-time email verification API catches invalid addresses at the point of signup — before they enter your funnel.
Trusted by 5,000+ Modern Revenue Teams
From signup forms to marketing lists to outbound campaigns, clean email data powers everything in SaaS.
Verify emails in real-time during user registration. Block disposable, temporary, and invalid addresses before they create accounts.
Try Signup Verification arrow_forwardUpload your newsletter and marketing lists. Remove hard bounces, catch-alls, and inactive addresses to improve campaign deliverability.
Clean Your Lists200ms verification endpoint that plugs into your signup flow, Stripe billing, or onboarding pipeline. Catch bad emails before they cost you money.
View API Docs arrow_forwardOur API verifies emails in real-time during signup — blocking fake accounts before they enter your system.
During signup, your form sends the email to our API.
We verify the mailbox exists in under 200ms.
Valid emails proceed. Invalid or disposable emails are blocked.
Every user in your database has a verified, deliverable email address.
Already have thousands of users with unverified emails? Upload your user list and identify which addresses are still active. Reduce your email sending costs and improve deliverability metrics.
Export User Emails
From your database, CRM, or email marketing tool.
Bulk SMTP Verification
Identify valid, invalid, catch-all, and disposable addresses.
Update Your Database
Remove or flag bad addresses. Reduce costs and improve metrics.
A simple, powerful API that verifies emails in real-time. Plug it into your signup flow and stop fake accounts before they start.
JSON responses for easy parsing. 200ms latency.
Pre-built blocks for low-code automation.
Connect 5,000+ apps in seconds.
Compliance-first data sourcing.
curl --request POST \
--url https://api.mailsfinder.com/v1/verify \
--header 'Authorization: Bearer YOUR_KEY' \
--data '{
"email": "user@example.com"
}'
Verify emails at signup to improve trial-to-paid conversion. Real users with real emails convert 3x better.
Clean your marketing lists before product launches and feature announcements. Deliverability directly impacts ARR.
Integrate our API into your auth flow in under 30 minutes. RESTful, well-documented, and battle-tested.
Verify customer emails before sending renewal notices and upsell campaigns. Don't lose revenue to undeliverable addresses.
Real-time email verification catches invalid addresses before they enter your SaaS funnel. 200ms API. 99% accuracy. Start free.
