Email Warm Up Guide: All to Know

Find out what email warm up is, the benefits of it, how to do it manually and automatically, and all you need to know about email warmup.
Have you ever found yourself crafting the perfect email campaign with carefully personalized messages, eye-catching subject lines, and attracting cold email CTAs to go along with it?

You're confident that your list of potential customers is eager to hear from you. So, you hit send and await the flood of engagement.

Yet, to your sorrow, not one response or even an email is open.

What went wrong?

A key factor in successful email campaigns isn't just about well-crafted content and a clean list of relevant leads. It's also about ensuring that your emails get delivered -- and this is where email warmup plays a significant role.

Enter the world of email warm-up.

In this article, we'll explore the concept of email warm-up: what it is, and why it's essential for email success.

What is Email Warm-Up?

Email warm-up is the process of gradually increasing the number of emails sent from a new email account. The main goal of this practice is to build a positive reputation with email providers and avoid being flagged as spam.

In the past, email reputations were built solely by keeping an eye on the number of emails sent. For instance, if a brand new email account sent 15 emails on the first day of use, it wouldn't raise any eyebrows.

However, if that number suddenly jumped to a thousand emails in a day, it would appear suspicious to email service providers. Meeting the acceptable email numbers was all it took to build a good reputation back then.

These days, email service providers (ESPs) consider various factors when evaluating the legitimacy of your email activities. One crucial aspect they consider is how recipients interact with your messages.

Factors such as whether your emails are opened, replied to, or marked as important are taken into consideration. On the contrary, if your emails are ignored, deleted, or flagged as spam, your reputation takes a hit.

As a result, showing that recipients value your emails is a crucial aspect of modern-day email warm-up.

Why Do You Need to Warm Up Your Email?

why warm up your email

Email Warm-Up Improves Deliverability for Sales and Marketing Campaigns

Email warm-up is a game-changer for your sales and marketing email campaigns. It helps ensure that your well-crafted emails land in the recipient's inbox, maximizing visibility and engagement.

Imagine kicking off a sales or marketing campaign by sending out tons of emails all at once - it's like stepping onto a stage without any prior introduction. Internet Service Providers (ISPs) are naturally cautious about unknown senders flooding their networks, often flagging them as potential threats.

Email warm-up is the hero in this situation, coming to your rescue by gradually increasing the volume of emails you send over a controlled period, showing ISPs that you are a legitimate sender, and building trust and credibility.

During the warm-up process, ISPs keep a close eye on key metrics like bounce rates, spam complaints, and recipient engagement. Slowly ramping up your email volume, shows your responsible sending behavior, positively influencing your sender's reputation.

As a result, your sales outreach and marketing emails have a much better chance of reaching the intended inboxes than being banished to spam folders.

Email Warm-Up Builds Trust with ISPs

Gaining trust with Internet Service Providers (ISPs), which can be obtained via email warmup, is crucial for the success of your email communications. ISPs work diligently to safeguard users' inboxes from spam and unwanted messages.

In this context, the email warm-up process is essential to prove your commitment to sending legitimate emails and ensuring a positive user experience. This method steadily introduces your email-sending behavior to ISPs, making them familiar with your practices over time.

During the warm-up process, ISPs closely monitor various metrics, such as bounce rates and spam complaints, to evaluate the credibility of the sender. This evaluation is a critical part of the ISP's decision-making process as they determine whether to trust a sender to deliver worthwhile content to users' inboxes.

Email warm-up, therefore, serves as a trust-building exercise that can foster a positive sender reputation, ultimately increasing the likelihood of your emails reaching their intended recipients.

Email Warm-Up Protects and Repairs Your Sender Reputation

Your sender reputation determines whether your emails are accepted or flagged as suspicious. Warming up your email is the key to maintaining a positive reputation.

When you send emails without warming up, it can raise red flags with Internet Service Providers (ISPs) and result in your messages being marked as spam or even blocked.

Email warm-up helps fix a damaged sender reputation, often caused by previous spam complaints or high bounce rates. The warm-up process allows you to analyze your email campaigns and identify any issues that may have led to a tarnished reputation.

By starting with a low volume of emails and keeping a close eye on key metrics, you can address and rectify any problems, allowing you to rebuild your sender reputation.

Email Warm-Up Helps Scale Sales Outreach Quicker

Warm-up is a crucial step in scaling your sales outreach efficiently. While it might sound time-consuming, it's critical in building a solid reputation for your emails, which in turn sets you up for success in your sales outreach. To manually warm-up your emails, follow a short and gradual process that takes a couple of weeks.

Start by sending a few emails and then incrementally increase the number of emails you send. This step-by-step approach helps improve your email reputation, allowing for a more effective sales outreach when you're ready to go full-scale. For a faster warm-up process, consider using an automation tool. This efficient option speeds up the email warming, allowing you to focus on your sales outreach strategy sooner.

By automating the warm-up, you're investing in a personal trainer for your emails, ensuring they are ready for prime performance. Skipping the email warm-up might seem tempting, but it's not the best approach. Doing so is akin to starting a marathon without stretching - you might eventually reach your goal, but it will take longer and be more challenging.

Properly warming up your emails generates positive signals to enhance your reputation much quicker. Additionally, avoiding negative feedback from unhappy recipients can save you precious time in the long run.
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How to Warm Up Your Email

Manual Email Warm-Up

Manually warming up your email account is crucial for maintaining a strong reputation with email service providers (ESPs).

1. Select Your Audience Carefully

Kick-off the process by using the email accounts you own, like your personal Gmail or an old Hotmail account from school. To effectively warm up your email-sending capabilities, you'll need assistance from others.

Talk to friends, family and colleagues who are willing to help. The goal is to have a diverse range of accounts to interact with, enabling you to build your reputation across various ESPs.

2. Gradually Increase Your Sending Volume

Resist the urge to send emails to your entire contact list all at once. Instead, start slow and gradually increase your sending volume over time.

Incrementally escalating your email frequency allows for a seamless integration, helping you gain familiarity and trust with both recipients and ESPs.

3. Foster Engagement

Encourage the recipients of your emails to open, reply, and mark your messages as important. Their engagement is a crucial aspect of the warm-up process. If any of your emails end up in a spam folder, ask the recipient to move it to their inbox and mark it as safe.

4. Be Patient and Persistent

Although manually warming up your email account is free, it requires time, patience, and understanding from your friends and family.

By adhering to these steps, you'll improve your email deliverability and maximize the effectiveness of your outreach efforts.

Automated Email Warm-Up

Automating your email warm-up process can significantly improve your sender reputation, Unfiltered is here to make that effortless for you.

Instead of spending countless hours manually sending and responding to warm-up emails, a dedicated email warm-up tool like Unfiltered does the work for you.

However, it's crucial to select the right email warm-up tool. To help you make an informed decision, consider asking the following questions when evaluating different services:

  • Do they use real accounts to build reputation, or do they rely on free/temporary email accounts?
  • Are the messages sent by the tool legitimate or just nonsensical text?
  • Does the service only send and receive messages, or does it also ensure proper engagement with those messages?

The answers to these questions can greatly impact your sender reputation.

To get started with Unfiltered, create an account and link your email address. Our AI intelligently analyzes your email sending patterns and manages the warm-up process for you.

Once your account is set up, Unfiltered automates the email warm-up by gradually increasing your sending volume over a defined timeframe.

During the warm-up process, you have the option to customize your email text using our AI-powered feature, which makes the texts being sent out legitimate, and on-brand and further boosts trust and enhances your sender reputation.


In conclusion, email warm-up plays a vital role in executing successful email campaigns, establishing trust with ISPs, and upholding your sender reputation.

Both manual and automated email warm-up techniques offer benefits, but adopting software such as Unfiltered can save you valuable time and effort while providing a dependable warm-up.

Incorporating email warm-up in your email marketing or sales outreach strategy is essential—your deliverability rates and sender reputation will certainly appreciate it!

So, don't miss out on this crucial step to improve your email success, give a try today.
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