send For Cold Email Senders

Email Finder for Cold Email Built for Volume

SMTP-verified addresses, bulk CSV lookup, and a REST API that plugs straight into Smartlead, Instantly, Mailshake, and Reply.io. Keep your bounce rate under 2 percent and your sender reputation intact.

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check_circle 99% accuracy check_circle SMTP verified check_circle No credit card
person Jane Doe, Acme Corp
bolt finding and verifying...
check_circle
jane.doe@acmecorp.com Verified, safe to send, 98% confidence
trending_down Bounce rate under 2%

Powering Cold Outreach at 5,000+ Sales Teams and Agencies

Regent Peak Myoprocess Lumina Global

How Mailsfinder Fits Your Cold Email Workflow

Cold email lives or dies on data quality. Mailsfinder handles the three jobs that protect your sender reputation before a single email leaves your sequencer.

person_search

Find

Pull a verified address from a name and company domain. Works for single lookups, bulk CSV uploads, or a live API call inside your enrichment workflow.

Try the finder arrow_forward
Critical
verified_user

Verify

Real-time SMTP handshake on every address. Catch-all domains get flagged, risky addresses get filtered, and your bounce rate stays under 2 percent so your sender reputation survives at volume.

Verify a list
sync

Ship

Export a clean CSV or push results straight to your sequencer. Smartlead, Instantly, Mailshake, Reply.io, Lemlist all supported via CSV import or REST API.

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From Prospect List to Sent Sequence in Four Steps

The cold email workflow most senders actually run. Prospect list, Mailsfinder, clean CSV, sequencer. No manual cleanup, no surprise bounces.

01
upload_file

Drop your prospect list

CSV with first name, last name, and company domain. Sales Navigator export works directly.

02
search

Find addresses

Mailsfinder discovers each address in real time from multiple sources, not a stale cache.

03
verified

SMTP verify

Multi step SMTP handshake plus MX check. Catch-alls and risky addresses get flagged before export.

04
rocket_launch

Push to sequencer

Clean CSV into Smartlead or Instantly, or API push straight into a campaign. Reputation stays safe.

description prospects_q3.csv 5,240 rows
4,612
Verified
418
Risky
210
Not found
Download clean CSV
Built for cold outreach volume

Bulk lookup, REST API, and every major sequencer.

SDR teams and agencies do not have time to babysit a finder. Drop a list of 10,000 prospects, walk away, come back to verified data ready to drop into Smartlead, Instantly, Mailshake, or Reply.io.

1

Bulk CSV processing

Upload up to 50,000 rows. Finder and verifier run in one pass, one credit per row, one final CSV.

2

REST API for automation

Plug into your enrichment pipeline. JSON in, verified address out. About 200ms for cached lookups.

3

Sequencer-ready exports

Columns mapped for Smartlead, Instantly, Mailshake, Reply.io, Lemlist. Drop the CSV, hit import, start sending.

4

Bulk verifier for cold lists

Already have addresses from a scraper or partner list? Push them through the bulk email verifier before they touch your sender.

Sequencers Mailsfinder feeds

forward_to_inbox
Smartlead
CSV and API
mark_email_read
Instantly
CSV and API
campaign
Mailshake
CSV
reply_all
Reply.io
CSV and API
outgoing_mail
Lemlist
CSV
extension
Zapier, Make, n8n
Any sender

What Cold Email Pain Looks Like With and Without Mailsfinder

Cold emailers are deliverability obsessed for a reason. One bad list torpedoes a sending domain and weeks of warmup. Here is how the numbers shift when verified data sits in front of the sequencer.

Typical bounce rate
under 2% with Mailsfinder
Versus 8 to 15 percent on raw scraped lists. Bounce rate above 5 percent is the line where sending domains get flagged.
Sender reputation
protected
Verified addresses keep complaint rates and spam traps off your domain. One bad week can cost a sender months of warmup.
Time per 1,000 leads
12 min vs 3+ hours manual
Bulk lookup and verification in one pass. No tab juggling between finder, verifier, and sequencer.
Workflow stage Raw scrape, no verifier Mailsfinder
Bounce rate at send 8 to 15 percent Under 2 percent
Domain reputation risk High, spam folder within days Low, inbox stays clean
Time per 1,000 leads 3 hours plus 12 minutes
Cost per verified lead $0.02 to $0.04 $0.00003 on Lifetime
Sequencer integration Manual CSV fix Direct CSV or API

A find endpoint that fits your cold email stack.

One POST request. A verified address back in milliseconds. Drop it into your enrichment job, your CRM trigger, or a Zapier hop into Smartlead.

api

REST and JSON

Clean responses, predictable schema, generous rate limits.

bolt

200ms cached

Cached lookups return fast. Fresh SMTP verify in a few seconds.

sync

Zapier, Make, n8n

Native steps so non engineers can wire enrichment in a click.

shield

GDPR ready

Compliance friendly sourcing for EU and UK outbound teams.

cURL Request

curl --request POST \

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

--header 'Authorization: Bearer YOUR_KEY' \

--header 'Content-Type: application/json' \

--data '{

"first_name": "Jane",

"last_name": "Doe",

"domain": "acmecorp.com",

"verify": true

}'

// response

{

"email": "jane.doe@acmecorp.com",

"status": "verified",

"confidence": 0.98,

"safe_to_send": true

}

Cold-Email Friendly Pricing

One credit pool covers finding and verifying. No surprise charges on Not Found results.

Monthly
$9.99 /mo

300,000 credits per cycle (finder + verifier)

  • check_circle Single and bulk finder
  • check_circle SMTP verification
  • check_circle CSV export for any sequencer
  • check_circle Zapier, Make, n8n
Start Free Trial
Most Popular
Annual
$7.99 /mo

300,000 credits per cycle, billed $95.88/year

  • check_circle Everything in Pro
  • check_circle Full REST API access
  • check_circle Priority support
  • check_circle Unlimited team seats
Claim Free Credits
Lifetime
$249 once

2,000,000 credits that never expire

  • check_circle All Annual features
  • check_circle Credits never expire
  • check_circle Future updates included
  • check_circle No recurring cost
Get Lifetime

Need a custom volume tier? Talk to sales.

Who Sends Cold Email With Mailsfinder?

From solo founders running their own outbound to agencies juggling fifteen client campaigns, the workflow is the same. Verified data into a sequencer that already works.

rocket_launch

Solo founders

Sending 50 to 100 cold emails a day from one or two inboxes. Need verified addresses without paying enterprise pricing.

groups

SDR and BDR teams

Running 200 to 500 cold emails per rep per day across rotated inboxes. Bounce rate above 2 percent gets the domain flagged.

campaign

Lead-gen agencies

Running outbound for 5 to 20 clients at once. Need bulk pricing, API access, and clean exports per campaign.

work

Consultants and recruiters

Sending 20 to 80 highly targeted emails a day. Reputation matters because every bounce shows up in their inbox provider score.

Frequently Asked Questions

Does Mailsfinder replace my cold email sequencer? expand_more
No. Mailsfinder is the find and verify layer of your stack. You still need Smartlead, Instantly, Mailshake, Reply.io, or Lemlist to send sequences, manage inbox rotation, and handle replies. Mailsfinder feeds those tools clean, SMTP-verified addresses through CSV export or API.
How does Mailsfinder keep my cold email bounce rate low? expand_more
Every address goes through a real-time SMTP handshake before we return it. MX records get checked, catch-all domains get flagged, and risky addresses get filtered out. The result is a bounce rate that consistently stays under 2 percent, which is the threshold most inbox providers use before they start tanking sender reputation.
Can I find and verify emails in bulk for a cold email campaign? expand_more
Yes. Upload a CSV with first name, last name, and company domain. Mailsfinder processes thousands of rows in minutes and returns a clean CSV with verified emails, confidence scores, and bounce risk flags. Drop the file straight into Smartlead, Instantly, or any sequencer.
Which cold email tools does Mailsfinder integrate with? expand_more
Mailsfinder works with Smartlead, Instantly, Mailshake, Reply.io, Lemlist, and any sequencer that accepts CSV imports. The REST API plus Zapier, Make, and n8n connectors let you push verified leads straight into a campaign without manual exports.
How much does Mailsfinder cost for cold email senders? expand_more
Most cold email teams pick the Monthly plan at $9.99 for 300,000 credits per cycle, or the Lifetime plan at $249 once for 2 million credits. Credits cover both finding and verifying, so a single pool handles the full workflow.
Will Mailsfinder write my cold email copy? expand_more
No. Mailsfinder finds and verifies the addresses you send to. Writing subject lines, hooks, and sequences is on you or your copywriter. If you are still iterating on subject lines, the cold email subject lines guide on the blog is a good starting point.
Is the Mailsfinder API fast enough for large prospect lists? expand_more
Yes. The find endpoint returns in about 200 milliseconds for cached lookups and a few seconds for fresh SMTP verification. Agencies regularly process 50,000 row prospect lists in under an hour using batched API calls and parallel workers.
Can I use Mailsfinder for compliance-sensitive regions? expand_more
Mailsfinder sources data from public records and premium providers and supports GDPR style data handling. You are responsible for sending compliance in your region, including suppression lists, unsubscribe handling, and any applicable opt-in requirements for cold outreach.

Send Cold Email That Lands. Not Cold Email That Bounces.

SMTP-verified addresses, bulk lookup, API into every major sequencer. 300,000 credits for $9.99 on the Lifetime plan.

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