Start your first campaign with 25 to 50 contacts, not 500. Twenty-five is enough to find out whether your message is understood. Fifty gives you a reply count you can read. Two hundred is for after the message has already worked, because a weak email sent to 200 people uses up 200 chances you could not take back.
The reason is arithmetic, not caution. A small batch produces so few replies that chance alone can make a good message look dead. The table below shows how much, and what each batch size is good for.
What a first batch is for
It is not for revenue. A first batch tests three things: whether this group of buyers is reachable, whether the message makes sense to them, and whether your list is clean. The bounces tell you about the list. The replies, including the unfriendly ones, tell you about the message. A first batch that gets two "not interested" replies has taught you more than one that gets none.
Hana runs Granite Peak IT Support, two technicians in Boise who look after small dental offices. She has a list of 160 offices and a new email. She will not send it to all 160. Here is how she decides.
25 contacts: the fastest way to learn
Twenty-five is right when the message, the buyer group, or both are untested. It is small enough that a bounce rate or a confused reply shows up after two or three days, and the 135 offices left on her list are untouched. You will not learn a reply rate from 25. You will learn if people understand the email.
Send 25 over two or three days, around 10 a day, and read every reply and every bounce. If four addresses bounce, the list has a problem to fix before you send anything else; how to find a company email format shows how to guess and verify addresses.
50 contacts: a reply count you can read
Fifty is the usual first real test, and it splits into two halves of 25 if you want to compare two subject lines. At 50 you may see between one and five replies, and that is enough to see a pattern in what people say. How to test a cold email with 50 prospects covers splitting and deciding.
200 contacts: only after the message works
Two hundred is the batch you send once 50 has told you the email is working. A practical rule is at least three positive replies from the 50, meaning people who asked a question or agreed to talk. That is a rule of thumb, not a law, and you can set your own bar, but set it before you send. Then 200 is not a gamble, because the message has already earned some replies.
The reply-count table
The reply rates below are what-ifs, not benchmarks. Real rates depend on your list and offer; what is a good cold email reply rate explains why a quoted figure from someone else's business means little. The last column is the chance of getting zero replies purely by luck, if the true rate were the one shown.
| Contacts | If 2 in 100 reply | If 5 in 100 reply | If 10 in 100 reply | Chance of zero replies at 2 / 5 / 10 in 100 |
|---|---|---|---|---|
| 25 | 0.5 replies | 1.25 replies | 2.5 replies | 60% / 28% / 7% |
| 50 | 1 reply | 2.5 replies | 5 replies | 36% / 8% / 0.5% |
| 200 | 4 replies | 10 replies | 20 replies | 2% / under 0.01% / under 0.01% |
Read the first row slowly. If the true rate is 2 in 100, a batch of 25 sends nothing back more than half the time. That does not mean the message is broken. It means 25 is too few to judge a reply rate, and good for finding out whether the email makes sense. The same message sent to 200 almost always gets at least a few replies, which is why 200 is the batch for confirming and scaling.
Batches versus monthly lead allowances
Batches fit inside the monthly lead allowance of a plan. In Rocketship, Launch includes 150 leads a month, so one batch of 50 uses a third of that month's allowance (a person Rocketship finds costs 2 leads, so a found batch of 50 uses 100), or you can send 25 now and 25 from the next segment. Frontier includes 500 leads a month and Mission Control 6,500, so a batch of 200 you bring yourself fits one month on Frontier. Phone numbers are a separate balance, called phone lookups, and do not come out of your leads; what lead enrichment is and costs explains the difference. Plans and prices are on the pricing page.
When to split the batch by segment
If your list has two kinds of buyer, a solo dentist and a six-chair group practice, do not mix them in one batch of 50. Send 25 to each with the same email and compare. If one group replies and the other does not, you have learned something about who to chase, and the batch size did its job. At 10 contacts a day, a batch of 25 takes three days and a batch of 50 five, which is about 30 minutes a day (see how to run outbound in 30 minutes a day). To work out how many contacts a customer takes, how many leads you need to get one customer helps.
Which size for your situation
New offer or new buyer group, start with 25. Message you have used before on a similar group, 50. A message with at least three positive replies from a batch of 50, 200 to the rest of that segment. A list you have not verified, 25 first, whatever else is true. And if your list is fewer than about 60 people in total, send to all of them in two rounds and treat the result as a conversation, not a statistic. For the comparison between this kind of outbound and other routes, see lead generation vs prospecting.
Rocketship finds the buyers, emails them from your own Gmail, follows up, and books the meeting on its own, and you choose the batch size. Plans that get you customers start at $24.99 a month (Launch), and both Launch and Frontier start with a 7-day free trial, card required.