What is a cold email sequence (and how it can help you generate more leads)

Digital Marketing | Lead Generation

Let’s be honest – growing a business isn’t cheap.

Maybe you’ve already tried paid ads, only to watch the costs climb. Maybe you’ve sunk hours into social media content, hoping it’ll drive enquiries… but it’s hard to measure the ROI. Or maybe you’re relying on referrals, but they’re unpredictable and hard to scale.

It’s also difficult to grow a business if you only rely on one channel.

Ad costs can suddenly become unaffordable, political decisions can affect the availability of platforms (hello… Tiktok) and the invention of AI means that relying on search engine-optimised blog content to drive traffic to your website is no longer a sure thing. 

So, what’s a marketer (or business owner) meant to do?

Enter cold email sequences.

Cold email sequences are a great complement to your other marketing strategies. They’re highly targeted, and affordable and help you start real conversations.

In this post, I’ll explain exactly what a cold email sequence is, how it helps you generate qualified leads, and how we run effective campaigns for our clients – without burning through your marketing budget or leaving your success up to chance.

First things first…

What is a cold email sequence?

Think of it like this: You’ve got a list of potential customers who’ve never heard of you before. You want to introduce yourself, explain how you can help, and (hopefully) get them interested in what you offer.

A cold email sequence is a series of emails sent automatically over a period of time to these potential leads. The aim is to spark conversations, build relationships, and open the door to future business.

It’s not spam. It’s strategic, personalised, and respectful of people’s time and inboxes.

Why cold emails work (when done right)

Cold emails, when written well and sent properly, can be incredibly effective for:

• Reaching potential clients you wouldn’t otherwise connect with.
• Starting meaningful conversations with decision-makers.
• Filling your pipeline with leads short-term – without relying solely on referrals or ads.

They’re especially helpful if you’re in B2B and want to target specific industries, roles, or companies. 

What do you actually need to run a campaign?

Here’s the setup (we handle all of this for our clients, by the way):

A good cold email platform 

Whenever we start talking about cold email campaigns, we inevitably get asked: “Can I just use Mailchimp for that?”

Short answer? No.

We get this question a lot, especially from businesses that already have a free Mailchimp account. The thing is, Mailchimp (and similar platforms) are designed for email marketing – that is, sending newsletters or promos to people who have already subscribed.

Cold emailing is a different beast. If you use Mailchimp for cold emails, you may get your account suspended – and your emails won’t reach many inboxes anyway. Email software is getting increasingly clever and will often mark these kinds of emails as spam. Your target audience will never see them. 

Instead, we recommend a platform called Instantly.ai. It’s designed specifically for cold email outreach, handles large volumes, and helps make sure your emails actually land in inboxes (not spam folders).

Fake domains to protect your website and email reputation

Here’s something most people don’t realise: If you send cold emails from your main domain (e.g., yourname@yourcompany.com) and people mark those emails as spam, search engines like Google can take notice.

This can affect your domain reputation, impact your SEO rankings, and even make it harder for your regular business emails to get through to clients.

What’s the fix?

We recommend setting up alternative domains and email addresses just for your cold email campaigns.

These domains are similar to your main one, so they feel familiar to your prospects, but they’re different enough that your main domain stays safe.

Here’s an example:

• Your “real” domain: ndtcompany.co.uk
• Alternative domains for cold emails:
  ndt-company.co.uk, ndt-testing.co.uk, ndt-in-wales.co.uk

You’d then set up email addresses like:

• yourname@ndt-company.co.uk
• y.name@ndt-testing.co.uk

Looks legit, right? But it protects your main website and emails from any negative fallout.

We recommend you start with 4 domains, each with 3 email addresses. 

A good sending reputation

When you set up brand-new domains and email addresses for cold emailing, they don’t yet have a sending reputation. Email providers like Gmail, Outlook, and Yahoo don’t trust them yet because they’ve never seen those domains sending emails before.

If you suddenly start sending hundreds or thousands of emails per day from a brand-new domain, it raises red flags. Email providers might think you’re spamming people, and your emails are more likely to land in the spam folder (or worse, your domain could get blacklisted).

Warming up means gradually building trust with email providers by:

1. Sending a small number of emails each day (starting very low, maybe 10-20/day).
2. Increasing the volume slowly over several weeks.
3. Ensuring those initial emails get positive engagement (opens, replies, not marked as spam).

Warming up helps your emails land in inboxes, not spam folders. It builds a solid sending reputation with email providers and increases the chance that your target audience will receive your emails. All of this maximises the effectiveness of your campaign.

Platforms like Instantly.ai often have built-in warm-up features. They send low-volume, real, conversational emails to a network of accounts that reply back – creating positive engagement signals automatically.

Typically, it takes 2 – 4 weeks to properly warm up a new domain and email address before launching a full campaign. But, we would recommend leaving it for as long as you can – maybe even up to 2 months before you begin. 

Copy for your cold email sequence

Once your fake domains and email addresses are warmed up, it’s time to create your campaign. Every campaign will require copy (the actual email content of the emails you’ll be sending to prospects.) 

But it’s not just a generic sales pitch – you need to strike the right balance between being personal, professional, and persuasive.

A good cold email sequence typically includes 

• an attention-grabbing subject line, 
• a short, friendly introduction, 
• a clear explanation of who you are and how you can help,  
• a simple call-to-action (like inviting the recipient to book a call or reply with a question). 

We absolutely advocate for you to include personalised touches – mentioning the recipient’s company name, role, or a pain point relevant to them. This makes the email feel genuine, not automated. 

A simple cold email sequence often has 3-5 emails spaced out over a few weeks, each designed to build trust, overcome objections, and encourage a response.

A “cleaned” list of prospects

And now to one of the most important parts of the process – creating a list of prospects. 

After all, even the best-written email won’t work if it’s landing in the wrong inbox. Here’s how to go about building a high-quality prospect list:

1. Define your target audience

Start by clearly defining who you want to target. This might include:

• Industry or sector
  
• Company size
  
• Job titles (e.g., decision-makers like Marketing Managers, CEOs, or HR Directors)
  
• Location
  
• Any specific criteria relevant to your product or service (e.g., companies using certain technology)
  

The clearer your target audience, the easier you can build a list that’s highly relevant.

2. Source the data

Once we know who you’re targeting, use trusted B2B data sources, professional databases, and specialist tools to find potential contacts. You can also gather data from LinkedIn, business directories, and other online sources to create a tailored prospect list.

3. Clean and verify the list

This step is crucial. Raw data often contains outdated, duplicate, or incorrect information. Before sending a single email, clean and verify every contact on the list to ensure:

• Email addresses are valid (no bouncing!)
  
• Contacts are up-to-date and match your ideal customer profile
  
• Duplicates and irrelevant entries are removed
  

You can use email verification tools to minimise bounce rates and protect your domain reputation, but at the end of the day, manually scrolling through and checking that you’ve got the right prospects is (unfortunately) the best way to ensure that you’re not sending to some random company in Alaska!

Just as a story to illustrate this point, I was once creating a prospect list for a non-destructive testing company (think power plant safety) and had to delete a load of personal security firm information. Don’t forget to clean your list!

Someone to monitor the campaign

So now you sit back, relax and let the leads roll in?

Unfortunately not. 

Once your cold email campaign is up and running, it’s crucial to actively monitor it.

Monitoring ensures that everything is working as it should and keeps your campaign compliant with regulations like GDPR. You’ll need to watch for replies (both positive and negative), promptly remove anyone who asks to unsubscribe and handle any potential issues like spam complaints. 

Regular monitoring protects your domain reputation, keeps you legally compliant, and helps maximise your return on investment.

It will take a few weeks (if not a month or two) to complete the campaign. Remember, you’re sending several emails to hundreds (maybe thousands) of people. The software will take time to send them all.

Is cold email worth it?

If you want a cost-effective, scalable way to generate leads and grow your business, yes.

Cold email sequences help you reach the right people, at the right time, with the right message – without spending a fortune on ads.

It takes a bit of setup, but once it’s in place, the system can run like clockwork (with us handling all the details behind the scenes).

But it’s not a magic bullet. 

Cold email is a numbers game. Not every recipient will reply, and you’ll need a well-researched list and strong messaging to see good results.

Cold email campaigns work best in conjunction with other marketing efforts, particularly great content marketing. Pointing prospects to a high-quality, highly targeted piece of persuasive content or a great piece of social proof on your website can increase the likelihood of your campaign’s effectiveness. 

Want to start your own campaign?

We’d love to help. If you’re ready to give cold email a try – or just want to chat through the details – get in touch.

We can guide you through the whole process and help you turn cold emails into real, warm leads.

Let’s make it happen.