A Step-by-Step Domain Warm-up Guide

Domain warmup steps

Ever wondered why sending thousands of emails with a new domain gets your email address blocked or has a very low delivery rate? A crucial step in saving your emails from getting flagged as spam is to warm up your domain for mass emailing. In this article, we will discuss the step-by-step process one needs to follow to warm up domains.

Table of Content

What is domain warm-up?

The email warm-up is a method for developing a sender reputation and increasing the email sending limit for a new email account. The warm-up procedure involves sending email messages from a new email account to a smaller number of people and progressively increasing the number of emails every day.

In 2019, Google took more stringent steps from email sending and receiving sides to detect spam emails.

The email service provider gives daily sending limits when a user opens a new email account. However, a new account can't use it entirely. Ideally, it takes 8-12 weeks to accomplish maximum deliverability. The warming-up process may seem sluggish and repetitive, but it is essential when you want to escape the dreaded spam folder.

Why do you need to warm up your domain?

Email domain warm-up signals your service provider that you are not a robot or scammer. It becomes crucial when you are preparing a high-volume cold email campaign from a new account. Given below are the most important reasons you should not overlook the domain warm-up process.

Avoid spam folder

Every domain acquires a reputation that ranges from bad to good. The host considers a new account suspicious from the outset. Hence email warm-up service is needed to ensure that emails reach the receivers' inboxes and build a good domain reputation.

Email throttling

Email throttling implies controlling the number of email messages sent to one ISP or remote server at one time. When a large volume of emails is sent at once without domain warm-up, the receiving ISPs often block these messages because they seem spam.


As per SMTP protocol, a greylist is a list of email addresses or domain names used by a spam filter to detect suspicious emails. If a message comes from the list's address or domain, it will temporarily be blocked. You must warm-up your domain to steer clear of greylisting.

Bounce rates

When you send emails to email addresses that do not exist, your emails get bounced. Email warm-up tools can help you early on to be in the safe zone and eliminate bouncing.

In a nutcase, domain warm-up will increase your deliverability and open rates while decreasing your bounce rates.

A step-by-step guide to email domain warm-up

Domain warm-up demands your time and efforts, as it is a long-term commitment. You might want to use your existing company domain to send emails. As it already has a good reputation, it reduces the energy needed for warming it up. Unfortunately, you might encounter problems and burn your primary domain of everyday business. So, register a new domain and prepare it for email outreach. Follow the steps listed below to warm up your domain:

1. Authenticate your email

Account authentication is the first thing required with a new email address. After registering a single domain name for email outreach, follow these steps:

2. Send emails manually

It is always good to start sending emails cautiously till you have gained the email service provider's trust.

  • You should send 10-20 individual emails from the new email address at the opening juncture. A short-cut tip from Mailmodo is to send them to an email list containing known email addresses.

  • Ensure there is a clear interaction with the initial emails, which will increase the engagement rate of emails.

  • During this time, send emails to various email services like Gmail, Yahoo, Outlook, iCloud, Godaddy, etc., to broaden your email spectrum.

3. Build a definite warmup schedule

To achieve full email deliverability, generate engagement in your warm-up emails.

  • It is vital to have some daily conversations as it is a continuous 8-12 week operation. Having a faithful response base gives the ISP a hint about your legitimacy.

  • Subscribe to a few newsletters related to your enterprise sector, regularly getting emails is just as critical as sending new emails to warm up.

  • Double the volume of emails every two weeks.

4. Personalize your emails during warmups

Lastly, add as many non-robotic touches to your emails.

  • Don't send too many emails to the same address at once. Neither should you send an email at a specific time. For example, you can alter between mornings and evening and the number of days.

  • Avoid fraud-seeming terms in your email copy like donate, free, etc. at the very start. As most of people will mark a mail with a long subject line as spam, be smart with your words to attract open clicks.

  • Add an unsubscribe link otherwise your email will look unprofessional. Your credibility can be impacted adversely by even a single spam report against the new account.

  • Personalize your emails by adding as many names as possible. Open rates are increased by about 22% by adding the recipient's name in the subject line.

Keep an eye on the process and if the domain warm-up is not meeting your expectations, consult an expert. This brings us to the next part.

How can Mailmodo help with your domain warm-up?


provides you with dedicated service from the moment you sign up. We do regular follow-ups of our clients regarding any issue they might face. How can we offer you the right email warm-up service?

  • Mailmodo is a superior email marketing platform with proven deliverability. Our clients celebrate an increase in over 225% conversion rates by using interactive AMP emails.

  • Using Mailmodo's email marketing software, you can send bulk and triggered emails helping you to automate the warm-up process.

  • Mailmodo provides a dedicated account manager for enterprise clients to warm up the email domain. Our experts will back you up with any queries regarding the process.

  • Mailmodo's integrated trackers help you monitor your emails' output and export full reports of user activities & campaign results.


The strictness of the algorithm is to maintain a grip on the junk emails. As you are a genuine user, help the system realize that you are not a spammer by following the practices mentioned above. While you are learning and becoming a pro, Mailmodo is here to provide a one-stop solution to warm-up your domain and send interactive emails that help you get more conversions.

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