Help / Attendee list outreach
How to use an attendee email list for targeted B2B outreach
Updated November 8, 2026. Read from Sales.co sending data and the sources listed below that day.
To use an attendee email list for B2B outreach, confirm where the list came from, clean it, split it by role, and send a short first email that names the event within days of it, then follow up. In 1,928,800 Sales.co emails (October 2025 to October 2026), 24% of interested replies came from a follow-up.
This page is for sponsors, exhibitors and sales teams who come home from a conference or trade show with a file of names, or who are offered one. It covers the steps from the file to a booked meeting. Sales.co does not sell event attendee lists; our $295 email lists are by profession and industry. If the event list is small, use it for the warm follow-up and use an industry list for the rest of the market.
Quick picks: what are you doing?
| Your situation | The one move | Tool |
|---|---|---|
| Before the event, with the registrant list from your sponsor package | Ask for a 15-minute meeting at your booth, naming the day and the hall | Follow-up templates |
| At the event | Scan badges and write one line per conversation, so the next email can quote it | Your badge-scan app |
| After the event, your own badge scans | Email inside the same week and open with what you talked about | List cleaner |
| After the event, the organizer's attendee file | Read the contract's use terms, then send one email that names a session they likely attended | Disposable email checker |
| Offered an "attendee list" by an online seller | Ask how they got the data and test 50 rows before you buy or send | Email format finder |
How to go from attendee list to meeting in seven steps
- Know where the list came from. Your own badge scans are people you met. A registrant file from the organizer comes with the contract's terms. A list bought from a third party may not be attendee data at all. You are done when you can say, in one line, how each name got onto the file.
- Clean it. Paste the file into the free email list cleaner to drop duplicates, bad addresses and typos and to flag info@ and noreply@ inboxes, then test what is left against 10,143 throwaway domains with the disposable email checker. You are done when every row has one real work address.
- Split it by role and company. Put buyers, users and vendors in separate groups. A badge list mixes exhibitors, speakers and other sellers with the people you want. You are done when each group gets its own first line.
- Write a first email that names the event. One short paragraph: the event, the reason you are writing to this person, one question. Check the subject with the subject line grader and the body with the spam checker. You are done when it reads like a note from someone who was there.
- Send at the right time. Send within the same week, during the buyer's working day; in our data, emails sent 9am to 5pm Eastern did about twice as well as the rest. The best time to send study has the hour-by-hour numbers. You are done when the send is scheduled, not sent at midnight.
- Follow up. Plan one or two follow-ups before the first email goes out; the follow-up reply rate study shows how much comes from them. You are done when the follow-ups are in the sequence with dates.
- Book the meeting. Reply to interested answers the same day with two times or a calendar link. You are done when the meeting is on both calendars.
What our sending data says about timing and follow-ups
These numbers come from 1,928,800 emails Sales.co sent from October 6, 2025 to October 18, 2026, across 60 sending workspaces. They are cold email in general, not event lists alone, so treat them as the floor an event mention should beat.
| Cut | Emails | Interested replies | Rate |
|---|---|---|---|
| All emails | 1,928,800 | 2,931 | 0.152% |
| Sent 9am to 5pm Eastern | 1,047,609 | 2,102 | 0.201% |
| Sent outside those hours | 881,191 | 829 | 0.094% |
In the same data, of the 2,689 interested replies where the step was recorded, 645 (24%) answered a follow-up rather than the first email. A one-email blast to an attendee list gives up about a quarter of the interest it could have had.
Limits: the law, the contract and the seller
- US law. CAN-SPAM (15 U.S.C. 7704) bars materially false header information and requires a clear notice of how to opt out and a valid physical postal address. It also makes it unlawful to keep emailing someone more than 10 business days after they opt out.
- EU attendees. GDPR needs a lawful basis for using the data. Article 6(1)(f) allows legitimate interests, and Recital 47 says direct marketing "may be regarded as carried out for a legitimate interest". It is not automatic, so check with counsel before emailing a European list.
- The organizer's terms. A registrant list from a sponsor package comes with a contract. It may cap how many emails you send or how long you may use the file. Read it first.
- Third-party sellers. A file sold online as a show's "attendee list" may be an industry list with an event name on it. Ask the seller how they got registrant data from the organizer, and if the answer is vague, treat it as a cold industry list.
What it costs
The tools on this page are free. If you want a wider list than the event gave you, a Sales.co industry list is $295 one time as a CSV, with hard bounces refunded proportionally. If you want us to write, send and follow up, the done-for-you service is $2,000 a month for up to 10,000 emails, $2,500 for up to 15,000 and $3,000 for up to 20,000. See pricing. For the wider playbook, read cold email lead generation or how to generate leads for B2B sales.
Comparing list sellers before you buy one? The best B2B email list providers prices seven sellers on 1,000, 5,000 and 10,000 contacts.
Sources
- Emails, interested replies, hour and follow-up splits: Sales.co sending data, 1,928,800 emails, October 6, 2025 to October 18, 2026, computed November 2, 2026 (the data behind the best time to send study), read November 8, 2026.
- CAN-SPAM requirements: 15 U.S.C. 7704, Cornell Legal Information Institute, read November 8, 2026.
- GDPR lawful basis: GDPR Article 6 and Recital 47, read November 8, 2026.
- Prices: pricing page and email lists page, read November 8, 2026. Tool facts: disposable email checker and free email list cleaner, read November 8, 2026.
FAQ
Can I cold email people from an event attendee list?
In the US, yes, if each email follows CAN-SPAM: a From line and subject that are not misleading, a working opt-out honored within 10 business days, and your postal address. For EU attendees, GDPR applies, and if the list came from the organizer, its contract may limit how you use it.
How soon after the event should I email attendees?
Within the same week, while the event is still a shared reference. Name the event in the first line and send during the working day: in Sales.co's sends, emails sent 9am to 5pm Eastern drew interested replies at about twice the rate of the rest of the day.
Are attendee lists sold online real?
Some are and many cannot show where the data came from. Ask the seller how it got registrant data, check a sample of 50 rows by hand, and run the file through a list cleaner before you send to the rest.
How many follow-ups should I send to event attendees?
Plan one or two. Across 1,928,800 Sales.co emails, 24% of interested replies answered a follow-up rather than the first email, so a single send leaves about a quarter of the interest on the table.