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MailToaster: Email warm-up overview
MailToaster: Email warm-up overview

Learn what the email warm-up is, how it works, what you can achieve using it, and how to set it up in your MailToaster account

Mailtoaster Team avatar
Written by Mailtoaster Team
Updated over a week ago

What is an email warm-up?

Emails sent from a new domain often end up in spam or junk if you start sending cold emails from it right away. Even a new email account based on an old domain has the risk of being temporarily blocked if you start actively sending emails.

To reduce such risks, it's recommended to form a good sending reputation first. This can be done with the help of the email warm-up.

When should I use a warm-up?

You can use the warm-up to improve the reputation of:

  • a recently purchased domain

  • a new email account based on the old domain

  • an old domain that was not used for a long time

  • a particular template that shows low deliverability

  • an actively used domain that experiences spam/junk delivery issues

  • an actively used domain that sends cold outreach only

How does the MailToaster warm-up work?

The warm-up service provided by Mailtoaster is an automated peer-to-peer technology that will automatically exchange emails between all clients who have signed up for the warm-up. Emails delivered to your Inbox will be automatically opened, replied to, and marked as important. If your email goes into the Spam or Junk folder, the service takes the email out of spam or junk, marks it as important, and replies. As a result, your deliverability improves.

How to use MailToaster warm-up?

Before sending any emails from your domain, we recommend that you check your domain configuration, as this is the basis of email deliverability. Here's a detailed guide on how to improve your email deliverability score. If you need any assistance, please feel free to contact us via live chat.

To get started with MailToaster, follow these steps:

  1. Open the sign-up page and create a new account. Enter your credentials and click "Sign up."

  2. Navigate to the Warm-up emails tab and add your email account(s) to the warm-up by clicking the "Add mailbox" button in the top right corner.

  3. Select your provider.

    If you have selected Google or other provider mailboxes, enable two-factor authentication in your email account and generate an app password.

If you select Outlook, just enter your credentials.

5. Select a warm-up profile for the email account:

  • Reputation Protect. Use this profile if you are warming up email accounts that are actively used for cold outreach and have already been warmed up. We recommend keeping the warm-up on “Reputation Protect” to maintain a high sender score as well as good deliverability rates.

  • New Email Account. This profile warms up new email accounts. You can use this profile when you hire a new employee, when an agency starts working with a new client, or when there's a need to start sending more emails per day than previously. As soon as your “Daily Goal” has been reached and the sent warm-up emails are safely landing in your recipients' primary inbox folders, we recommend switching the profile to “Reputation Protect” while keeping the same “Daily Goal” value.

6. Select the number of daily emails you are going to send after the warm-up is completed:

  • Daily goal. Set the number of emails you would like to send daily after the warm-up. The daily goal cannot be higher than 50. Please keep in mind that the higher the daily limit, the higher the risk.

  • Daily increment. Choose how fast the daily goal should be reached. The recommended value is ≤ 5. For example, if you set 4 as a daily increment, 4 more emails will be sent every day until you reach your daily goal. Today, 4 emails will be sent; tomorrow, 8; the day after tomorrow, 12; and so on, until you reach 50 emails each day or any other daily goal you have set.

7. Click Start Warm-up for mailbox.

8. Switch on the toggle in the top right corner of the page to start the warm-up process.

That's it. MailToaster will automatically send emails to all the clients who signed up for the service. When the daily goal for sending emails is met, you will be notified.


  • After you start warming-up your email account, you may also receive emails from other warm-up users. To keep your inboxes clean from other warm-up emails, set an inbox filter to filter incoming emails from other participants.

  • We recommend you not use recently created domain/email accounts connected to the warm-up service elsewhere. For instance, do not use them with other services or send manual emails from them.

Warm-up emails page overview

On the Warm-up page, you can find three tabs:

  • Metrcis

Here you can view the dashboard with statistics on your warm-up activities: number of emails being sent, emails arriving in your inbox and spam folders, etc.

This tab also includes a "Mailbox Health" section, which allows you to check the deliverability of your email account. Read this support article, "Email Account's Health Checker Overview," to learn more about the health check.

  • Templates

Using this tab, you can set the text of the email that will be used during the warm-up.

You can use autogenerated texts or custom templates with your own text. If you'd like to proceed with your custom templates, click the Add template button and select a particular email template.

Keep in mind that using real email templates in the warm-up will improve their deliverability. At the same time, other warm-up participants may see them. For this reason, we recommend using templates only if they do not contain any sensitive information.

  • Settings

This tab allows you to change settings for warm-up activities. The tab contains a list of all settings; expand the particular block to make changes. Here's a description of all the blocks on the tab:

  1. Warm-Up profiles. Here you can change the type of your profile: switch between reputation protect or a new email account.

  2. Daily goal. In this block, you can change the number of emails to be sent daily and the daily increment.

  3. Mailbox settings. Here you can change the settings for the connected email account that is currently warming up. Change email account, generate a new password, etc.

  4. Signature. Here you can configure your signature, which will be added to all email messages sent from your email account. You can set your email signature by entering it manually or copying and pasting it from your email client to the text area below.

How do I proceed when the email warm-up is over?

Once you’ve reached your daily goal and emails start landing in inbox only, we recommend you keep it up for a couple of days to ensure and improve the results.

When you are ready to start with cold emailing, please remember that you’ll still need to increase your sending volumes gradually. You can find some guidelines here: How to warm up a new domain before sending cold emails

You can keep warm-up enabled to support your cold outreach.

Keep in mind that warm-up is a good tool to help you manage your reputation, but good deliverability is based on multiple factors and requires a strategic approach to achieve the desired results.

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