Exploring the Capabilities of Bulk Domain Email Search

The Bulk Domain Search is designed to extract email addresses associated with a range of companies or domain names. Utilizing our comprehensive database of publicly accessible professional email addresses, this tool delivers optimal results for each domain. Users can refine their search by selecting specific departments (like executive, marketing, HR, IT, communication) and the nature of the email (generic or personal).

Reliability and Confidence Scoring of Sourced Email Addresses

Our Domain Search gleans email addresses found publicly online. Each email is accompanied by a confidence score, which is derived from a variety of factors like source reliability, SMTP checks, and contextual analysis on web pages.

Accessing Bulk Domain Search - Free Trial and Premium Options

Access to the Bulk Domain Search is available through a Free account, with plans varying based on your request volume. You can evaluate the Bulk Domain Search with a trial. Upload a CSV file to see the quantity and quality of discovered email addresses, the required number of requests, and a data preview. Subscriptions can be cancelled anytime.

// bulk operations

Bulk Domain Search

Upload a CSV of company domains and find all associated email addresses at once.

Start Bulk Processing View API

Domains or company namesUp to 25,000 rows a jobCSV, list or rows

domain-search-list.csv2,500 rows · domains or company namescompleted

Bulk Domain Search · /bulk/search2,500 / 2,500

01pendingPOST /v1/bulk/search201 · { "data": { "id": 1042 } }
02runninglaunch: trueprogress polled with GET /v1/bulk/search/1042/progress
03completedbulk.completedsigned webhook delivered to your webhook_url

GET /v1/bulk/search/1042/download?file=fullCharged at the first download · the job expires after 180 days

// 01 · input

The input of a bulk Domain Search job

Upload a CSV of up to 4 MB in the app, or send a list, rows or a file to POST /v1/bulk/search. Columns are found from the header row; set a field index to choose one yourself.

POST/bulk/searchColumns

domain_field_index: Domain
company_name_field_index: Company name

POST/bulk/searchOptions

input_type: domain or company; company when the input has a company name column and no domain column
max_emails_per_domain: Addresses per domain: 1, 10 (the default), 20, 50 or 100
email_type, email_type_mode: all (the default), personal or generic; only (the default) or priority
departments, departments_mode: Department names such as ["sales", "marketing"]; only or priority
verify_emails: true verifies the addresses found
find_phones: true adds phone numbers, at an extra cost
include_sources: true adds the web pages where each address was found
boost_score_from_sources: true adds 10 points, up to 90, to an unverified address found on at least 5 pages

// 02 · api

One request starts the job

Create and launch it in one call, then follow its progress or receive a signed bulk.completed event. Each result row is what GET /domain-search returns.

POST /bulk/search

curl -X POST "https://api.tomba.io/v1/bulk/search" \
  -H "X-Tomba-Key: $TOMBA_API_KEY" \
  -H "X-Tomba-Secret: $TOMBA_SECRET_KEY" \
  -H "Content-Type: application/json" \
  -d '{"name":"Domain Search job","list":"piedpiper.com\nshopify.com\nnotion.so","launch":true,"webhook_url":"https://hooks.example.com/tomba"}'

const res = await fetch("https://api.tomba.io/v1/bulk/search", {
  method: "POST",
  headers: {
    "X-Tomba-Key": process.env.TOMBA_API_KEY,
    "X-Tomba-Secret": process.env.TOMBA_SECRET_KEY,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "name": "Domain Search job",
    "list": "piedpiper.com\nshopify.com\nnotion.so",
    "launch": true,
    "webhook_url": "https://hooks.example.com/tomba"
  })
});
const { data } = await res.json(); // { id }

import os, requests

res = requests.post(
    "https://api.tomba.io/v1/bulk/search",
    headers={
        "X-Tomba-Key": os.environ["TOMBA_API_KEY"],
        "X-Tomba-Secret": os.environ["TOMBA_SECRET_KEY"],
    },
    json={
      "name": "Domain Search job",
      "list": "piedpiper.com\nshopify.com\nnotion.so",
      "launch": True,
      "webhook_url": "https://hooks.example.com/tomba"
    },
)
job_id = res.json()["data"]["id"]

POST /bulk/search

201 Created

{
  "data": {
    "id": 1042
  }
}

Each row, as GET /domain-search returns it

200 OK

{
  "data": {
    "organization": {
      "website_url": "piedpiper.com",
      "organization": "Pied Piper",
      "location": {
        "country": "US",
        "city": "Palo Alto",
        "state": "CA",
        "street_address": "5230 Newell Road",
        "postal_code": "94303"
      },
      "social_links": {
        "twitter_url": null,
        "facebook_url": null,
        "instagram_url": null,
        "linkedin_url": "https://www.linkedin.com/company/pied-piper",
        "github_url": null,
        "youtube_url": null,
        "pinterest_url": null,
        "tiktok_url": null
      },
      "disposable": false,
      "webmail": false,
      "phone_number": false,
      "industries": "computer software",
      "founded": "2014",
      "company_size": "11-50",
      "company_type": "privately held",
      "revenue": null,
      "accept_all": false,
      "description": "Pied Piper builds middle-out compression for files, video and a decentralized internet.",
      "pattern": "{first}",
      "total_similar": 2,
      "keywords": [
        "compression",
        "middle-out",
        "decentralized internet"
      ],
      "ranking": null,
      "whois": {
        "registrar_name": null,
        "created_date": null,
        "referral_url": null
      },
      "last_updated": "2025-01-15T10:32:00+01:00"
    },
    "emails": [
      {
        "email": "dinesh@piedpiper.com",
        "first_name": "Dinesh",
        "last_name": "Chugtai",
        "full_name": "Dinesh Chugtai",
        "gender": "male",
        "phone_number": false,
        "type": "personal",
        "country": "US",
        "position": "Software Engineer",
        "department": "engineering",
        "seniority": "senior",
        "twitter": null,
        "linkedin": null,
        "score": 99,
        "verification": {
          "date": "2025-01-15T10:32:00+01:00",
          "status": "valid"
        },
        "phone_data": [],
        "sources": [
          {
            "uri": "https://piedpiper.com/blog/engineering",
            "website_url": "piedpiper.com",
            "extracted_on": "2024-06-01T09:14:07+01:00",
            "last_seen_on": "2025-01-10T17:02:44+01:00",
            "still_on_page": true
          }
        ]
      },
      {
        "email": "gilfoyle@piedpiper.com",
        "first_name": "Bertram",
        "last_name": "Gilfoyle",
        "full_name": "Bertram Gilfoyle",
        "gender": "male",
        "phone_number": false,
        "type": "personal",
        "country": "US",
        "position": "Systems Architect",
        "department": "engineering",
        "seniority": "senior",
        "twitter": null,
        "linkedin": null,
        "score": 97,
        "verification": {
          "date": "2025-01-15T10:32:00+01:00",
          "status": "valid"
        },
        "phone_data": [],
        "sources": [
          {
            "uri": "https://piedpiper.com/blog/engineering",
            "website_url": "piedpiper.com",
            "extracted_on": "2024-06-01T09:14:07+01:00",
            "last_seen_on": "2025-01-10T17:02:44+01:00",
            "still_on_page": true
          }
        ]
      }
    ]
  },
  "meta": {
    "total": 12,
    "pageSize": 10,
    "current": 1,
    "total_pages": 2,
    "params": {
      "domain": "piedpiper.com",
      "company": "",
      "page": 1,
      "limit": 10,
      "department": "engineering",
      "country": null,
      "type": "all",
      "live": false,
      "enrich_mobile": false,
      "webhook_url": null
    }
  }
}

// 03 · cost and limits

What a job costs

Nothing is charged to create or launch a job. Its cost is charged once, at the first download of its results.

// billing per row

Per domain with at least one address: 1 search credit per 10 addresses returned, at most 10. Plus 5 per address with phone data.

Bulk billing in the docs

Rows: up to 25,000 per job
Jobs created: 15 per day for each type
Running jobs: 2 per type
Downloads: 25 per day for each job
Request size: 4 MB (CSV, list or rows)

// 04 · use it anywhere

Run Domain Search jobs from the app or your code

The same job, the same credits: upload a file in the app, call the API, or work from a spreadsheet or a no-code tool.

The full request reference: /api/bulk/domain-search

// 5,000-lead benchmark

More valid emails than the eight other tools we tested

Real data. Same input. No human touch. Full transparency. We ran a head-to-head test using the same 5,000-line input file across multiple email-finding tools.

Tomba.io found 4,015 valid emails from 5,000 leads: #1 of 9 tools tested.
Rank	Tool	From websites	From company names	Total
1	Tomba.io	2,02681%	1,98979.6%	4,015
2	Anymailfinder	1,91876.7%	1,95778.3%	3,875
3	Findymail	1,88075.2%	1,87775.1%	3,757
4	GetProspect	1,48359.3%	1,61364.5%	3,096
5	Skrapp	1,00140%	1,14145.6%	2,142
6	Hunter	88735.5%	99539.8%	1,882
7	VoilaNorbert	1,05142%	74930%	1,800
8	Snov	98839.5%	Under 1% found from company names: the tool needs a website or domain:190.8%	1,007
9	Prospeo	82433%	Under 1% found from company names: the tool needs a website or domain:220.9%	846

Tomba.io found 4,015 valid emails from 5,000 leads: #1 of 9 tools tested.

Tomba’s own test, February 2026. One file of 5,000 leads, 2,500 with the company website and 2,500 with only the company name, ran through each tool with no manual cleanup. Only addresses a tool labelled valid or verified count; percentages are of the 2,500 inputs of each kind.

Under 1% found from company names: the tool needs a website or domain.

View raw data spreadsheet

// faq

Frequently Asked Questions

Still have questions? Visit the help center