How to Find All Email Addresses at a Company Domain (2026)
Domain search is the process of discovering all email addresses associated with a company domain. Instead of looking up one person at a time, you get a list of verified contacts at the entire organization.
This is one of the most useful capabilities for account-based sales, recruiting, and competitive intelligence. A single API call can map out the reachable contacts at any company.
How domain search works
Domain search combines multiple techniques to discover email addresses at a company. It tests common email patterns (first.last@, first@, flast@) against known employees, checks public sources for associated addresses, and verifies each candidate against the live mail server.
The result is a list of verified, deliverable email addresses at the domain. Each address has been confirmed via SMTP verification, meaning the mail server accepted it as a valid recipient at the time of the lookup.
With emailfinder.dev, the Company Emails endpoint returns up to 20 verified addresses per domain. You pass the domain as a parameter and get back a JSON array of confirmed emails. The entire process takes a few seconds.
Account-based sales
In account-based selling, you target specific companies rather than individual leads. The challenge is building a contact map for each target account. Who are the decision makers? Who are the influencers? Who is the end user?
Domain search gives you a starting point. Run the company domain through the API and you get a list of reachable contacts. From there, you can identify roles, prioritize outreach, and build multi-threaded campaigns that engage multiple stakeholders.
This is significantly faster than looking up contacts one by one. A sales rep can map 50 target accounts in the time it would take to manually research 5.
Recruiting and talent mapping
Recruiting teams use domain search to map teams at target companies. If you are hiring engineers and want to source from specific companies, a domain search reveals who is reachable at each organization.
This is particularly useful for agency recruiters working retained searches. You can quickly identify potential candidates at competitor companies or companies in the same industry, then reach out directly via email rather than relying on LinkedIn InMail.
Combined with the LinkedIn Lookup endpoint, you can cross-reference the discovered emails with LinkedIn profiles to get full context on each person before reaching out.
Competitive intelligence
Domain search can reveal the size and structure of a company's team based on discoverable email addresses. While it does not return every employee, the addresses it finds give you a sample of who works there and what roles exist.
For market research, this helps you understand how competitors are structured, what departments they are investing in, and who the key people are. Combined with public information from LinkedIn and company websites, it builds a useful picture.
Handling large companies vs small companies
Domain search works differently depending on company size. For small companies (under 50 employees), you may discover most or all of the team. For large enterprises, the 20-address limit means you get a sample rather than a complete list.
For large companies, combine domain search with targeted lookups. Use the Company Emails endpoint to get an initial set of contacts, then use the Person Email or Decision Maker endpoints to find specific individuals you need to reach.
Some large companies use catch-all mail servers, which accept any address at the domain. In these cases, domain search may return fewer results because the API cannot distinguish real mailboxes from catch-all acceptance. The addresses it does return are ones where it has high confidence.
Integration patterns
The most common integration is triggering a domain search when a new account is created in your CRM. A webhook fires, calls the Company Emails endpoint, and writes the discovered contacts back to the account record.
For bulk account mapping, you can run a list of target domains through the API in batch. At 1,000 requests per minute, you can map 1,000 companies in under a minute. Each successful lookup costs 5 credits.
Some teams run domain search on a schedule to discover new contacts at existing accounts. People join companies, and new email addresses become discoverable over time. A monthly re-scan of your target account list catches these additions.