5 Reasons Why You Should Warm-Up Your Emails Before Any Cold Outreach

Created On
September 30, 2023
5 Reasons Why You Should Warm-Up Your Emails Before Any Cold Outreach

Email marketing is the most successful lead generation channel in 2023, even in the time of social media outreach. There are 4.3 billion email users worldwide and 80% of email users prefer email as their primary business communication channel. 

This proves the efficiency of email marketing, especially cold email outreach. However, if you just create a new email address (or revive an inactive email account) and start sending cold emails, your emails will (definitely) land in spam folders. In the worst case scenario, your domain might get blacklisted

This is where email warm-up comes into play. You need to warm-up your inbox to maintain a positive sender reputation and high email deliverability rates.
You might wonder, why should you warm up your email accounts before cold outreach. Let’s take a look at its benefits. But first, let’s discuss what email warm-up is and how it works. 

What is Email Warm-Up?

Email warm-up is the process of improving the sender reputation of an inactive or now email account to increase its email deliverability

You can warm-up your email accounts manually by sending a gradually increasing number of emails to different recipients. However, it’s not scalable for a business. On the other hand, sales engagement platforms or cold emailing tools such as Smartlead offer fully automated email warmup to improve the sender reputation. 

Email warm-up consists of various actions such as sending a small number of emails, gradually increasing the number of emails sent daily, marking them as important, moving them from the spam folder to the ‘Primary’ folder, replying to those emails, etc. 

Many experts suggest that you should warm-up your email address for at least 8-12 weeks. However, the warm-up period can vary for new email addresses.

Smartlead’s algorithm emulates human sending behavior and gradually increases (ramps up) the number of emails sent each day. 

It's recommended to start with 10-20 emails per day and increase the sending limit once the active campaign is finished. You should at least warm-up your existing email account for 2 weeks. And if you are starting with a new domain, the ideal warm-up period is 2-3 months. 

5 Reasons Why You Should Warm-Up Your Email Account Before Cold Outreach

As we discussed above, email warmup is one of the most crucial aspects of cold emailing. It establishes a positive reputation for your domain. Here are the 5 reasons why you should warm-up your email account before cold outreach: 

1. Building Positive Domain Reputation 

Building and maintaining a positive domain reputation is a priority to achieving high email deliverability. High email deliverability is the key to reaching the primary inbox of your cold prospects. 

Instead of bombarding your recipients with emails (and getting flagged by the spam filters), a well-built warm-up strategy takes a measured approach. If you gradually increase the number of emails sent out, you make the email service providers (ESPs) believe that you are not just a random spammer, spamming.

Smartlead uses a unique "Custom warm-up identifier Tag" or a unique 2-word phrase assigned to each mailbox in your Smartlead account to replicate human sending behaviors. 

By consistently delivering relevant, engaging, and non-spam content, you achieve a positive sender reputation, which determines whether your emails will land in spam or the primary folder. 

2. Avoiding the Spam Folders

Imagine launching a cold email campaign with brilliant email copy in hope for positive responses. To your surprise, you don’t achieve the desired reply rates. Why? 

It’s highly likely that your cold emails landed on your prospects’ spam folders, instead of the primary inbox. Thanks to the spammers, email service providers (ESPs) like Gmail and Outlook are on the lookout for suspicious email activity. If they detect a sudden influx of emails from a completely new (or dormant) email account, they quickly mark that sender as spam.

This is where email warm-up comes in handy. Email warm-up is the gateway to bypass all spam traps and land in your prospects’ inbox. By gradually increasing your email sending volume and engaging with recipients who actively interact with your emails, you signal to internet service providers (ISPs) that you're a legitimate sender, thus improving your sender reputation. As a result, your emails are more likely to land where they should – the inbox.

3. Improving Email Deliverability Rates

Email deliverability is the kingmaker when it comes to email marketing, especially for cold email outreach (as you are sending unsolicited emails). It decides whether your message lands in the inbox or to the spam folder. Warming up your email account has a significant impact on your email reputation for cold outreach.

When you tailor your warm-up strategy to your specific domain, you're telling ISPs that you are a legit email sender, not a scammer. 

Consistency is the key for email deliverability. Email service providers need to see consistent positive email engagement and quality email practices in line with the CAN-SPAM act and GDPR. 

When you warm up your email accounts, ISPs begin to recognize your sender address and reputation. They'll prioritize your emails over those from unknown senders.

So, if you want your cold outreach emails to land in the primary inbox of your prospects, warm-up your inbox. Build that reputation, earn that trust, and watch your email deliverability rates go 🚀

4. Maximizing Audience Engagement

The goal of cold emailing isn’t just conversions or revenue generation, It's about building relationships, making meaningful connections, and getting your audience to not just open your emails, but also engage with them. So, by building trust and credibility through warm-up activities, you're increasing the chances of your recipients of not just opening your emails but also clicking on links and taking the desired actions.

If you warm-up your email accounts, you're essentially boosting your email marketing ROI. By improving deliverability and increasing engagement, your emails become more effective, leading to higher conversion rates and, ultimately, more sales. 

5. Offers Room for A/B Testing 

One of the most important aspects of warming up your email accounts is that it offers room for A/B testing. When you are strategizing your cold email campaign, instead of shooting in the dark, you can test your email copies and other variables through warm up emails. 

Begin by sending a small batch of emails to your most engaged subscribers or internally in your team. This is your chance to monitor the engagement. This way, gradually ramp up the volume and frequency of emails over a few weeks.

Why is it important, you think? 

It lets you experiment with different content, subject lines, and send times to figure out what works best with your audience. And by the time you'll launch a full-fledged cold email campaign, you'll already have insights and data to craft your emails. This will improve your cold email success rate dramatically. 

Want to dive deeper into A/B testing? Read Cold Email A/B Testing


As an email marketer, if you don't warm up your email accounts properly, your efforts will go nowhere. Email service providers (ESPs) use algorithms to offer a spam-free experience to their users. That's where the warm-up comes in. By showing engagement, you can prove yourself to be a valid sender (and not a spammer). So, don't rush it – warm-up your email accounts, and watch your sales targets start soaring. 

What’s a Rich Text element?

The rich text element allows you to create and format headings, paragraphs, blockquotes, images, and video all in one place instead of having to add and format them individually. Just double-click and easily create content.

  • dfbvrsg
  • svsv

Static and dynamic content editing

A rich text element can be used with static or dynamic content. For static content, just drop it into any page and begin editing. For dynamic content, add a rich text field to any collection and then connect a rich text element to that field in the settings panel. Voila!

How to customize formatting for each rich text

Headings, paragraphs, blockquotes, figures, images, and figure captions can all be styled after a class is added to the rich text element using the "When inside of" nested selector system.

Author’s Details

Sattwik Das

Sattwik is a Digital Marketing professional at Smartlead. He is a dedicated content writer who focuses on juggling words to bring out meaningful content. He is experienced in well-researched and SEO-optimized content creation, content editing, and copywriting for various businesses throughout the globe. His expertise in SEO, SMM, and SMO with a touch of creativity helps businesses grow and maximize their credibility and sales.


Edited by:

Sattwik Das


People will also read

Frequently asked questions

General Questions

What are active leads?

Email automation FAQs- Smartlead

Active leads are the contacts you upload in Smartlead, similar to contacts in HubSpot; if you upload 1000 leads to a campaign, they are considered 1000 active leads. If you upload similar leads to a new campaign, they are not considered a “new active lead” as they already exist in our system.

Do you provide mailboxes, or do I need to connect my own?

Email automation FAQs- Smartlead

We don’t offer mailboxes yet. You need to get your own dedicated list of mailboxes using popular providers like Gmail, Outlook, Zoho, and others that exist in the market. Once you get them, follow our detailed guides to connect them quickly.

Do you offer guides and articles on succeeding with cold emails?

Email automation FAQs- Smartlead

Absolutely, one of our most popular guides can be found right here. It's been used by a large percentage of users to go from zero to cold emailing experts. Covering all topics from email infrastructure to copywriting and lead sourcing.

Is another tool needed for warmups?

Email automation FAQs- Smartlead

No, Smartlead has over 200,000 highly reputed mailboxes connected. The advantage you get along with naturalized AI conversations is access to aged domains you will never find in any warmup tool.

What is the API commonly used for?

Email automation FAQs- Smartlead

It is used popularly by agencies to automate their entire lead generation process as well as to connect Smartlead to external tools to push and pull data from. You can also connect to 1000s of apps using Zapier.

What type of businesses sees the most success with Smartlead?

Email automation FAQs- Smartlead

Anyone that can close deals from demos will succeed with Smartlead. It works for Sales companies, Marketing agencies, SaaS businesses, Recruitment, and offline companies (like construction).

Do you provide me with lead sources?

Email automation FAQs- Smartlead

We do not provide you with leads. You will need to use other data providers. These leads can be automatically added to Smartlead using our API or bulk uploaded via our CSV upload system.

Do you integrate with any CRMs?

Email automation FAQs- Smartlead

We're building native integrations with Hubspot, Salesforce, Close, Pipedrive, and many more. The best part, due to our open API and Webhook infrastructure, you can connect to any CRM in the world without an issue.

How many team members can I add?

Email automation FAQs- Smartlead

You can add an unlimited number of team members, as well as assign them roles and authority access.

Do you have custom plans beyond the Pro plan?

Email automation FAQs- Smartlead

Yes, it's common for many people to move to Custom plans after a few weeks. You can view all the options for up to 10M leads on the subscription page once you sign up for free.

Powerful Automated Email Marketing that Drives Sales.

  • All Features Included
  • No Credit Card Required
  • Free Warmup Included