Email Finder for Customer Research | Find User and Prospect Emails for Interviews

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Single Candidate Lookup

Recruiting a specific user or buyer? Enter their name and company domain to get a verified email in under a second, then send the interview request.

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Bulk Candidate Sourcing

Upload a CSV of shortlisted users from LinkedIn or your CRM. Mailsfinder returns verified emails for the whole list in minutes, ready for recruitment outreach.

Start Bulk Sourcing

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Research Ops API

Wire verified contact data into Airtable, Dovetail, or your research panel using the REST API. Automate ongoing recruitment pipelines for continuous discovery.

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How Mailsfinder Builds Your Research Recruitment List

01

input

Define Your Target Users

Paste a name and domain, or upload a CSV of candidates shortlisted from LinkedIn or your CRM.

02

database

Multi-Source Search

We cross-reference public records, web sources, and pattern matching to locate the right work email.

03

verified_user

Real-Time Verification

Every email passes SMTP handshake and MX record validation, so your recruitment outreach lands cleanly.

04

send

Export and Recruit

Download a verified CSV or push directly into your research ops stack and start sending interview invites.

Why Research Teams Pick Mailsfinder

Most prospecting tools are built for sales volume, not research signal. Mailsfinder is priced and tuned for the way PMs, UX researchers, and founders actually recruit.

1

Verification is built in, not a separate spend

Every email is verified via real-time SMTP handshake at the point of lookup. No second tool, no extra line item on your research budget.

2

300,000 credits for $9.99 per month

That works out to $0.001 per verified email. Hunter charges $0.025 per email. Apollo charges $0.02. For research teams sourcing waves of candidates, the cost difference is significant.

3

100 free credits every day, forever

Run a small qual study without entering a credit card. 100 daily credits cover most early-stage discovery and pre-PMF founder research.

JTBD_Study_PMs_at_SaaS.csv

Recruitment Pool Ready

100%

Done

Verified Candidates Found 487

Names Researched 500

Bad Addresses Filtered 13

Accuracy Rate 99.2%

How Mailsfinder Stacks Up for Research Recruitment

Pricing and feature comparison based on verified competitor data.

Feature	Hunter.io	Apollo.io	RocketReach	Mailsfinder
Starter Credits	2,000/mo	2,500/user/mo	1,500/mo	300,000/mo
Cost Per Email	$0.025	$0.020	$0.053	$0.001
Built-in Verification	Separate	Yes	Separate	Yes (SMTP)
Accuracy	91%	91-94%	85-90%	99%
Free Plan	50/mo	75/user/mo	5 lookups total	100/day forever

Automate Your Research Recruitment

Feed verified candidate data into your research ops stack, panel, or recruitment workflow using the REST API and low-code integrations.

api

REST API

JSON responses with confidence scores on every result.

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n8n & Make

Pre-built blocks for automated recruitment pipelines.

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Zapier

Connect to Dovetail, Airtable, Notion, and 5,000 more.

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Google Sheets

Enrich candidate sheets directly inside your spreadsheet.

cURL Request

curl --request POST \

--url https://api.mailsfinder.com/v1/find \

--header 'Authorization: Bearer YOUR_KEY' \

--data '{

"full_name": "Priya Anand",

"domain": "notion.so"

}'

The Full Research Toolkit

Free tools you can pair with Mailsfinder for cleaner research recruitment.

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Free Email Finder

Look up a single candidate by name and company domain.

verified

Free Email Verifier

Confirm a recruited contact is real before sending the invite.

pattern

Email Pattern Detector

Reverse-engineer a company's email format for outreach.

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Email Finder for Cold Email

When research turns into outbound, use the cold email workflow.

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LinkedIn Email Finder

Pull emails for candidates shortlisted on LinkedIn or Sales Navigator.

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Email Finder Overview

Compare all Mailsfinder workflows for finding verified contacts.

Plans That Fit Research Budgets

Start free. Scale into structured discovery when your study grows.

Monthly

$9.99 /mo

Billed monthly. Cancel anytime.

check_circle 300,000 verified credits per month
check_circle Single and bulk lookup
check_circle Built-in SMTP verification
check_circle CSV export and integrations

Start Monthly

Built for Every Research Role

From JTBD interviews to pre-PMF founder discovery, Mailsfinder fits the recruitment loop.

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PMs Running JTBD Interviews

Recruit users in specific buying contexts so your Jobs-to-be-Done research captures real switching moments, not opinions.

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UX Researchers at SaaS

Source qualified users at target companies for usability tests, diary studies, and concept validation without panel fees.

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Pre-PMF Founders

Talk to 50 to 200 ICP candidates during customer discovery. Validate the problem before building the product.

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Qual Research Consultants

Run client studies at margin. Build verified recruitment pools quickly without burning the project budget on panel recruiters.

Frequently Asked Questions

Can I use Mailsfinder to recruit users for customer interviews? expand_more

Yes. Mailsfinder is widely used by product managers and UX researchers to recruit interview participants. You can pull verified emails for users at specific companies, by job title, or from a CSV of LinkedIn profiles you have already shortlisted. Every email is verified at lookup, so your recruitment outreach reaches real inboxes instead of bouncing.

How does Mailsfinder help with JTBD or ICP discovery interviews? expand_more

When you are testing a Jobs-to-be-Done hypothesis or sharpening an ICP, you usually need to talk to a specific kind of buyer at a specific kind of company. Mailsfinder lets you take a list of target accounts and pull verified emails for the exact roles you want to interview. That keeps your research signal clean instead of recruiting whoever happens to be available.

Is the data accurate enough to use for research recruitment? expand_more

Mailsfinder verifies every email via real-time SMTP handshake and MX validation before it reaches you, with 99% accuracy. For research recruitment that matters, because a bounce means a lost interview slot and a slower study. Lower bounce rates also keep your sender reputation healthy so future recruitment emails keep landing.

How many interview candidates can I find on the free plan? expand_more

You get 100 free credits every day with no credit card required. That is enough to source roughly 100 verified interview candidates per day, which covers most small qual studies. If you are running a larger study or recruiting continuously, the Monthly plan at $9.99 includes 300,000 credits per month.

Does Mailsfinder work with LinkedIn for recruiting users? expand_more

Yes. Many researchers shortlist candidates on LinkedIn or Sales Navigator, export the list, and then use Mailsfinder to add verified emails. You can also use the REST API or Google Sheets integration to enrich a list of names and company domains in bulk. That turns a manual prospecting exercise into a clean dataset for outreach.

Can I use Mailsfinder for pre-product-market-fit customer discovery? expand_more

Pre-PMF founders use Mailsfinder to reach the first 50 to 200 people in their hypothesized ICP, run discovery calls, and validate whether the problem is real. The 100 free daily credits cover most of the early discovery phase, and the Monthly plan handles the next stage of structured outreach as the founder scales interviews.

Stop Guessing.
Start Talking to Real Users.

Get 100 free credits today and recruit verified interview candidates without a credit card, a panel fee, or a wait.

Start Free Trial Book a Demo

Find Real Users and Prospects For Your Next Interview