How to buy an email list

The buyer's checklist

Ask for each of these in writing, and test the sample against it.

Why a list's record count can overstate who you can reach

Public registers can keep entries for people who have retired and companies that have stopped trading, so a list built straight from a register inherits those entries unless the seller removes them. Two registers we use show the size of the gap.

The physician register holds about a fifth more individual registrations than the Association of American Medical Colleges counts active physicians, because doctors keep their NPI numbers after they retire or stop practicing. The two figures cover slightly different areas (the AAMC count includes US territories) and different years, so treat the gap as approximate.

The trucking census holds more than twice as many active carrier numbers as carriers that have filed their required MCS-150 update in the last two years. FMCSA requires carriers to update that form every two years (FMCSA Pocket Guide), so a number with no recent filing may belong to a company that has stopped hauling.

The unit of a row adds a third gap. One office with six dentists has six registrations, so a list counted in people can be several times larger than one counted in offices. Our physician register has ~483,000 registered practice addresses, and even that is an upper bound, since it keeps stale and duplicate addresses. When a seller quotes a count, ask what one row is and whether closed and duplicate entries were removed.

Questions to ask a list vendor

• What does one row describe: a person, an office or a company?
• Where did each email come from? Can I see the source page for any row?
• When was each email last verified, and how? Is the date on every row?
• How many emails are confirmed valid, how many are catch-all, and how many are unknown?
• What happens if emails bounce? Is the guarantee written down, and which emails does it cover?
• Which public registers or sources is the list built from, and what date is each source file?
• Were any emails generated from a name pattern rather than found published?
• How do you handle people who ask to be removed?

How email list pricing works

Email lists are sold in three main ways: as a flat-price file, by the record through credits, or by subscription. The figures below come from public price pages we opened on 4 October 2026 (listed in the sources). They are examples from three pages, not a survey of the market.

• Flat-price files. One niche file had a price for one state ($97) and for the whole country ($497). The nationwide file listed 67,989 practices but 39,817 unique emails, of which 30,022 were confirmed by the mail server, 6,800 were catch-all and 2,995 unknown.
• Credits. Pay-as-you-go sellers charge per contact revealed, and the price per contact falls as you buy more. One seller also offered hand-built lists from $499 for 1,000 records.
• Subscriptions. Prospecting platforms sell a monthly allowance of contact credits. One plan was $99 a month on monthly billing for 170 credits, with extra credits at $0.60 each.

Compare offers on the price per verified email. In the flat-price example, $497 buys about 0.7 cents per practice listed, but about 1.7 cents per confirmed email, because fewer than half the practices have a confirmed one. On a credit plan, check whether you pay for contacts that turn out to have no email or a catch-all one.

Red flags

• Promises of perfect accuracy or delivery. Addresses stop working as people change jobs and offices close, so no seller can promise that every one works.
• No source for the emails. If the seller can't say where an address was published, it may have been guessed.
• Unlimited guessed addresses. Under US law, sending to addresses generated "by combining names, letters, or numbers into numerous permutations" turns an ordinary CAN-SPAM violation into an aggravated one (15 U.S.C. 7704(b)).
• One "last updated" date for the whole file. It says nothing about the age of a given row.
• No sample, or a sample that differs from the paid file.
• A record count that is larger than the official count of the businesses or professionals in the niche. The register examples above show how that happens.

Test before you send to the whole list

Send to a small batch first and measure its bounce rate before you use the rest. Our bounce-rate benchmarks explain the limits sending platforms set (Amazon SES advises staying under 2%). Send to confirmed emails first. Keep catch-all emails in a separate group and send to them in small batches, because a domain that accepts every address can't tell you whether one mailbox exists. The catch-all emails guide explains why. Remove hard bounces at once and claim any refund the guarantee allows within its time limit.

Is it legal to buy an email list?

In the United States, buying a business email list is generally legal. The emails you send must follow the CAN-SPAM Act, which the FTC says "makes no exception for business-to-business email" (FTC compliance guide). Recipients in other countries fall under those countries' own rules. Our guide Is buying an email list legal? covers what CAN-SPAM requires, the penalties and the rules for phone calls and texts. This is general information, not legal advice.

How nodilist lists work

Each nodilist row is one office or organization, built from a public register, and each email carries the page or official register where it was published, the register's file date where there is one, and the date we last verified it, with its status: valid, catch-all or unknown. We update and verify your list when you order, so you receive a fresh list. Your file also shows its export date. We don't generate emails from name patterns. If more than 5% of the emails we mark valid hard-bounce within 30 days, we refund that share of your order. Catch-all and unknown emails are labelled separately and don't count toward the 5%. Card held at checkout, charged on delivery. The conditions are on the refunds and guarantee page. State files start from $39. You can order on each list's page, or request a free sample there first.

What this guide can't tell you

• Whether a particular seller's list is good. Only a sample, a test send and the seller's written terms can show that.
• What a list should cost for your niche. The prices above are examples from three public pages on one date.
• How the law applies to your campaign. This is general information, not legal advice.