Email warm up is an essential component behind the success of your cold emails. It represents a method of preparing an email address for future campaigns, helping it avoid the spam folder.

A good IP warming strategy is truly important, but particularly for bigger sales and marketing teams who use cold emailing extensively.

In this article, you'll learn:

What is IP warming or email warm up?

Email warm up (also known as IP warming) is a process that involves a gradual increase of your email sending volume. In order to build a good reputation, your email address needs to be warmed up. A warmed up address is one that has been sending and receiving messages regularly.

An email address can be at a different stage depending on how you've been using your account and how old your domain is.

How does the email warm up process look like? What's the best warm up schedule? How can you know when an email address has been properly warmed up? What to do if you have a new domain?

You're about to find out.

How to warm up an email domain in 2 ways

There are two ways in which you can warm up an email domain. You can do it automatically and manually.

I'll start with a hot IP warming strategy first. The one that performs the best, plus it's fully scalable so you can leverage it for your entire team too.

1. Use an email warm up service like lemwarm

The lemwarm story started with our users. One day in the lemlist community, Vaibhav opened a really important topic.

lemlist community

This is how lemwarm was born. We literally stopped what we were doing at the time, joined the conversation and decided to build one of the most important features for our community.

Btw, lemwarm is an email warm up service that allows you to send and receive emails from other lemlisters (our awesome users 😎). It's all done on autopilot, without you lifting a finger.

How it works

Since your account is connected to lemlist, we send emails to other lemlisters using your account with unique content. Each message and subject line is generated via our smart content algorithm. This is important because email providers will check and evaluate it.

On top of that, lemwarm email warmer will also create conversations by replying to those messages with more unique content and keep them under the same thread.

The beauty about these conversations is that you'll be joining a mailbox network that consists of 20K+ people from 100+ countries.

Unlike some other tools that offer warm up service, lemwarm doesn't allow fake email addresses to join as they ruin our email domains. Instead, you'll be exchanging emails with real people, including those from companies like Zendesk, Meero, Malt, Adeco, SAP, Uber, and more.

This is what makes lemwarm probably the world's coolest email warm up software.


How do you set up lemwarm?

There are three steps:

  • You need to log in to your account in lemlist
  • In the upper left corner, click on the dropdown menu and open lemwarm (or just press shortcut "W" when you log in)
  • Set up your desired warm up speed and click the "Start" button

As soon as you launch it, automatic warm up of your domain begins immediately. If you're working in a bigger sales team, you can warm up all their email addresses at the same time.

If your email account is young (6 months or less):

  1. Number of warm up emails per day after ramp-up is 30
  2. Ramp-up increment value per day is 1
ip warming strategy

This is the perfect setup for a new email address.

IF your email account is old (more than 6 months):

  1. Number of warm up emails per day after ramp-up is 40
  2. Ramp-up increment value per day is 2

Once you've done that, go to your email account and set up some rules. To be more precise, you want lemwarm emails to go to a specific folder and not drop in your primary tab. By doing so, you won't be mixing them with other emails.

email warm up

You should tick the following filters:

  • Always mark it as important
  • Skip the inbox (Archive it)
  • Never send to spam

This way, you're telling Google that these emails are important to you. Hence, they will never go to spam which makes it an even bigger sign to get the best domain reputation possible.

Special feature πŸ”₯ - Β If a lemwarm email goes to spam by any chance, we'll bring it back into your inbox automatically.

How long it will take to warm up your email?

The optimal time is one month. After 30 days, your email will be properly warmed up and ready to roll.

In case you want to send emails during the warm up process, we strongly suggest to keep lower sending volumes. Here's what we mean:

  • 25-50 emails a day during week 1
  • 50-100 emails a day during week 2, etc.

Increase gradually week after week. Afterward, you can go all in. By the way, even when this process is complete, keep lemwarm active so you're sure your email address stays warm. πŸ”₯

You also have reports at your disposal to see how things are going:

email warmup service

On top of that, you can also assess your weekly performance:

email warm up tool

Is the lemwarm email warm up tool reliable?

It's the most reliable email warmup tool you'll find on the market. Just type "lemwarm reviews" on Google and see for yourself.

Here's why that's the case:

  • lemwarm's complex, proprietary algorithm which operates on 100+ different parameters
  • real people with verified emails and no fake accounts in the network
  • 20K+ users worldwide
  • 25+ years domain range
  • automatically pulls your warm up emails out of spam and promotions

When you combine all these factors, they define lemwarm's reliability. This is why big brands like Zendesk and Malt trust our ip warming service.


We'd be thrilled to have you join our amazing mailbox network.

2. Manually warm up the inbox yourself

Another way to warm up your email domain is by going with the manual approach.

Obviously, it's more time-consuming. Another drawback of this method is that you have no insurance that people will reply. Btw, you need replies to be able to warm up your email address properly.

But if you're willing to go down this route, we're going to talk about a step-by-step plan in a minute.

For those of you who prefer the automatic warm up service and maybe got lost in the written tutorial above, we've prepared a video for you.

Manual IP warming strategy

The manual IP warm up strategy usually comes down to sending emails to your friends and acquaintances on your own, one by one.

That being said, you should also ask them to reply back. As previously stated, it's imperative for conversations to take place because email providers will be evaluating this kind of a behaviour.

Although warming up an ip address for email manually might take time, if you processize things, you'll be able to build a strong email address that's ready for cold email campaigns.

Let's address all the important questions you might have at this stage.

First, does IP warming email content matter to deliverability?

It's 2021 and email providers became even smarter throughout last few years, so they will be keeping an eye on the quality of your emails.

If you decide to exchange one-word warm up emails, let's just say that you will be warming up your domain similar to an athlete who decides to warm up just their knees, and not ankles.

You don't have to come up with super smart content either. Some emails can be longer, others shorter. But make sure it's meaningful and looks like something people would actually exchange in their inboxes.

Our advice is also to prepare templates for your friends and acquaintances so that they can just copy/paste and reply fast. Remember, you are fighting friction and should make people's lives easier.

Set up your email account profile correctly

I never really understood why people create fake accounts. If you're not a spammer or a fraud, it doesn't make sense.

As a Serbian who's first name is not easy to pronounce, I understand if you have doubts about going for an international market feeling handicapped. But I look at that handicap as fuel. It's like an underdog team beating reigning champions.

The brand behind your company name plays a strong role and can help you down the road. Having just Vuk is one thing, but Vuk from lemlist has more firepower.

Same applies to personal brands. Vuk who posts incredible LinkedIn content about growth marketing is totally different than just Vuk.

To cut the long story short, don't jeopardise your email account with fake or incomplete info. Email providers won't like it and it will impact your email reputation in the long-term.

Let's take Gmail as an example. You've created your address and you need to fill in the blanks.

Make sure to enter all the necessary information so it looks as complete as the example below. πŸ‘‡

Set up your email account profile correctly

Now you know when G's birthday is, so you can send him a cool gift when his day comes. πŸ˜‡

Example IP warm up schedule

Finally, let's see how your email warm up schedule could look if you decide to do it manually.

The numbers may vary depending on who you're emailing and what does your complaint rate look like.

Week 1

  • Start by sending 10 to 20 emails per day
  • In total, you should send between 70 and 140 emails in week 1

Week 2

  • We continue to crack on, but you raise the stakes to 20 to 40 emails a day
  • Total amount is 140-280 emails

Week 3

  • Now we move to 40-80 emails in a day

Week 4

  • Here you increase to 80-100 emails a day

Weeks 3 and 4 can be tricky do execute manually.

When it comes to replies and the amount you should receive, the answer is the more, the better.

At minimum, you should aim to achieve a 25% reply rate ratio. Meaning, if you send 200 emails, you should get at least 50 replies.

Sending 500 emails and getting no replies is a problem.

Key takeaways

Always keep in mind the following:

  • Email warm up is an essential component because it influences your sending reputation and email deliverability big time
  • When looking for email warm up software tools, make sure they're using real accounts from people, have reliable algorithm and sending practices you can trust
  • If you're going to do manual ip warming, make sure to go through the list in this article to perfect your schedule and email content

To conclude, email warm up is a critical component of your email reputation and deliverability audit. You're job as an outreach hacker is to execute it perfectly.