The first email lands in a busy hour and gets closed. That is not a rejection. It is a Tuesday.
The common advice is four or five messages spread across two weeks. We stop at three, and the reason is not squeamishness. Three is where the reply rate peaks in the data we have measured; on any given product the first campaign sets the real number. In that data: one message pulls about half the replies of three, and past three the rate falls while the volume, the cost and the annoyance all keep rising.
A follow-up that only says the previous one is unanswered is not a follow-up. Each one has to carry something the reader did not have before.
How many emails should a cold sequence have?
Three: an opener and two follow-ups. Hunter's report on 31 million emails sent in 2025 puts the reply rate at 3.3% for a single email and 6.8% for a sequence of three. Sequences of four or more reply less often than three.
| Emails in the sequence | Reply rate |
|---|---|
| 1 | 3.3% |
| 3 | 6.8% |
| 4 or more | below 6.8% |
Why not four to seven, as other guides say?
Ranges of four to seven usually count touches across several channels: an email, a profile view, a call. One channel has fewer honest ways to add something new, and each extra email is one more chance of a spam complaint. The agreement allows up to seven when a campaign has a reason for it.
Source: Hunter, The State of Cold Email, 31 million emails sent by Hunter users in 2025.
Three by default, seven at the most, fixed in the agreement before the first send. Whatever the number, the thread stops at it and a dead thread is never revived.