Cold email follow-up: why three emails are enough and the third one works

Many cold emails that go unanswered were never refused. They arrived on a busy morning, slid under twenty other messages and were forgotten by lunchtime. A cold email follow-up gives the same offer a second, then a third chance to arrive at a better moment.

My rule is three emails at most: the first email and two follow-ups, all in plain text, with a phone number in each. In the campaigns I run for clients, such as Pilotech’s, the third email still brings positive replies, from people who were busy or simply forgot to answer the first two.

This guide covers how many follow-ups to send, how long to wait, what to write in each and when to stop early. For the whole campaign, from the list to the replies, start with my guide to B2B cold emailing.

Why a cold email follow-up works: silence is not a no

Silence after a first email is not an answer. Some of the people you wrote to are not interested, and they will ignore the follow-ups too. Others were interested but busy: your email arrived during a site meeting, a lunch service or a deadline, and by the evening it was buried.

The people you write to run businesses. Your email competes with clients, suppliers, staff and invoices, and it is the one message in their inbox that they never asked for. Putting it off costs them nothing, so it is the first thing they put off.

A follow-up is not pressure, as long as it stays short and polite. Without follow-ups, you only ever reach the people who happened to have a free minute on the day you pressed send.

Why three emails are enough

I stop at three: one first email and two follow-ups, the low end of the three or four steps Instantly’s own help suggests for most cold outreach. Fewer, and you lose the busy people. More, and the sequence starts working against you, for three reasons.

More emails, more spam reports

Someone who has ignored three short emails is unlikely to welcome a fourth, and more likely to click Report spam. Gmail’s email sender guidelines ask senders to keep the spam rate shown in Postmaster Tools below 0.1% and never to reach 0.3%: fewer than one report per thousand emails, and never three or more. Those reports weigh on the reputation of the domain you send from, and that reputation decides where your next first email lands, including the one to a prospect who would have said yes.

More emails, fewer new contacts

Every step you add goes out from the same mailboxes. Instantly, the sending tool I use, recommends about 30 campaign emails per mailbox per day. Say you add 20 new contacts a day. With three emails each, once the follow-ups are running you send up to 60 emails a day, which two mailboxes can carry. Stretch the sequence to six emails and the same 20 contacts need up to 120 a day: four mailboxes, or half as many new contacts. That capacity is better spent on people who have not heard from you yet.

More emails, a worse impression

Your name is on every email. Three short messages read as persistence; six read as a machine that will not stop. The prospect who ignores you this month may need you next year, and you want them to remember a polite sender, not the one they had to block.

Why the third email still brings replies

People doubt this part, so here is what I have seen: in my campaigns, the third email brings positive replies. They do not come from people I finally convinced. They come from people who meant to answer the first two and never found the minute, because they were busy or they forgot.

Nothing about the offer changed between the first email and the third. The moment did. The third email lands on a different day, it is the shortest of the three, and answering it takes one call or one line. For someone who had been meaning to reply, it is the easy way to finally do it.

Answering often means calling. My emails carry a phone number and an invitation to call, and many prospects, architects especially, pick up the phone instead of writing back: a call fits a busy day better than a written reply, which gets buried under the rest of the inbox. The architects case study tells that story, and I compare the two channels in cold calling vs cold emailing.

Stop after the second email and you never hear from those people. Go on to a fourth and a fifth, and you are writing to people who have already had three chances to answer.

How long to wait between follow-ups

There is no official interval, and no gap suits every audience. A common starting point, and the one MLK Leadhunters gives in how to write a cold email that gets replies, is three or four days before the first follow-up and about a week before the second.

A few rules matter more than the exact number of days:

• Send on working days, in your prospects’ working hours. Set the sending window and the time zone in your tool’s schedule to theirs, not yours.
• Leave a longer gap before the last email. The second email catches people who missed the first; the third catches people who had a hard week.
• Respect out-of-office replies. If someone is away until the 28th, your next email to them should arrive after the 28th, not in a full inbox they will clear in one go. Check whether your tool treats an automatic reply as a reply.
• Mind the holidays. A sequence started just before Christmas or a bank holiday weekend lands in inboxes nobody is reading.
• Do not chase faster because the list is long. If the volume worries you, add new contacts more slowly.

Your sending tool sets the gap step by step; I build a full sequence in my Instantly campaign setup tutorial.

What to write in each follow-up: two templates

Each follow-up is shorter than the email before it, adds one new thing, offers the same way to reach you and keeps a one-line opt-out. My cold emails are plain text, with no links, no images and no HTML, and the follow-ups obey the same rule; I explain why in why I never put links in cold emails. Send the follow-ups in the same thread as the first email, so the prospect sees what you are following up on without searching.

The first follow-up: one new reason

The second email gives the prospect a reason to answer that they did not have before. Pick one:

• a detail of the offer they may have missed, such as a free visit or a fixed price;
• a recent job like theirs, described without naming the client unless you have permission;
• the answer to the objection they are most likely to have: price, timing or disruption.

Hello [first name],

[One new reason to answer, in one line: a detail of the offer, a similar job, or the answer to the obvious objection.]
[The same invitation to call, with the number, in one line.]
If you would rather not hear from me, just reply "no".

[First name] [Surname], [company]
[phone number]

The last follow-up: short, polite, the door left open

The third email is two lines. It restates the offer in a few words, gives the number again and offers an easy way out. That last line doubles as the opt-out every cold email needs.

Hello [first name],

Last note from me: if [the offer in a few words] could help with [their situation], call me on [phone number], even for a two-minute question.
If it is not for you, just tell me and I will not write again.

[First name] [Surname], [company]
[phone number]

These are templates, not the emails I write for clients, which stay private. For complete first emails built the same way, see my cold email examples.

What to leave out of every follow-up

• “Just following up” or “bumping this up”. It gives no reason to answer.
• “Did you see my email?” It blames the reader for being busy.
• A fake “Re:” on an email that is not a reply. It pretends a conversation that never happened.
• Guilt or false urgency, such as “I take it this is not a priority” or a deadline that does not exist.
• A link “to make it easier”. The phone number already does that job.
• More words than last time. A follow-up that grows reads like a sales letter.

When to stop before the third email

A sequence is a plan, not a promise. Take a contact out of it as soon as one of these happens:

1. They reply, whatever they say. In Instantly, the campaign option Stop sending emails on reply does this, and Instantly recommends switching it on (campaign options). A separate option stops the sequence for everyone at the same company when one person there replies.
2. They call. Your sending tool cannot hear the phone ring. Whoever answers the calls must tell whoever runs the campaign the same day, so the caller does not receive a follow-up after the conversation. In my campaigns the replies and the calls go to the client, not to me, which is why this handover has to be agreed before the first send.
3. They say no, in any form. “No thanks”, “take me off your list”, an annoyed call: all of them count. Stop at once, add the address to your block list so it never comes back in a future list, and never write again. The rules differ between the UK and France; my cold email GDPR checklist covers both.
4. The email bounces. A hard bounce means the address does not exist, and the next two emails would bounce as well. Verify your list before the first send, not after.
5. They are away. An out-of-office is not a refusal: hold the next email until after their return date.

After the third email: leave them alone, then learn

When the third email goes unanswered, the sequence is over. Do not move the contact straight into another campaign with the same offer. If you write again one day, do it with something genuinely new, such as a new service or a change in their situation, and never to anyone who said no.

Then look at the sequence step by step: which email brought replies, which brought calls and which brought nothing. Your sending tool counts written replies by step. For calls, whoever answers the phone can ask what made the caller pick it up that day.

Change one thing at a time. I A/B test my copy, and over time a campaign usually brings more responses, because I learn which wording worked and which did not. Test the follow-ups as you test the first email: a different reason in the second, a different last line in the third.

Judge the result on replies, calls and new clients, not on opens. If you want realistic numbers to compare yours with, MLK Leadhunters works through them in how many cold emails it takes to get one client.

Your cold email follow-up checklist

Before you launch a sequence, check each point:

1. Three emails at most: the first email and two follow-ups.
2. Each follow-up is shorter than the email before it and adds one new reason.
3. Every email is plain text, carries the phone number and has no link.
4. The follow-ups go out in the same thread, from the same mailbox.
5. The gaps are set: three or four days, then about a week, on working days and in your prospects’ working hours.
6. The sequence stops on any reply, and someone is in charge of stopping it after a call, a bounce or an opt-out.
7. Every email names you and offers an easy way to opt out, and opt-outs go on a block list the same day.
8. Someone who can sell answers the replies and the phone quickly. MLK Leadhunters covers that first hour in what to do with replies.

You do not need an agency to send three good emails. With a verified list, a sending tool and someone to answer the replies and the calls, you can run this yourself. If you would rather hand over the list, the writing and the sending, and keep only the conversations, that is how MLK Leadhunters works.