Mailbox warm-up: Improve the delivery rate of marketing emails!

Editor: GeeksendRelease time:2024-04-03 15:18:49

Mailbox warming is the process of proving to your email service provider (ESP) that your outgoing server and domain name are trusted by gradually increasing the volume and frequency of your emails before sending them out in bulk.

This process helps to establish and maintain the trust of your outgoing server with your email provider, thereby increasing the chances of your emails being successfully delivered to the recipient's inbox.

Mailbox warming is a step-by-step process that helps build an excellent reputation in the eyes of your email service provider (ESP).

If you send hundreds of marketing emails per day on a new email account, you can easily be recognised as a spammer, which puts your email account at risk of being blocked. By gradually increasing the number of marketing emails per day, you can slow down the alertness of ESPs and minimise the risk of a potential ban. This gradual strategy helps to build your credibility in email delivery, which in turn improves delivery rates, reduces the risk of being flagged as spam, and ultimately improves the success of your email marketing.

Mailbox warming is especially important in foreign trade marketing emails for the following reasons:

Increase Reputation Score: Mailbox providers usually monitor the activity of outgoing mail servers, especially new ones. By warming up your mailbox, you prove to these service providers that your outgoing mail server is legitimate, thus increasing your reputation score.

Reduce the risk of being flagged as spam: If you suddenly send a large number of emails without warming up, email service providers may flag your emails as spam because it looks like spam or malicious behaviour. By warming up, you can gradually build up the trust of the other party and reduce the likelihood of being marked as spam.

Improve delivery rates: An improved trust score and a reduced risk of being marked as spam will help ensure that your emails are successfully delivered to your recipients' inboxes, rather than being filtered into the spam folder.

Optimise email content: During the warm-up period, you can monitor metrics such as open rates and click-through rates to optimise the content of your emails. This helps to increase the level of user interaction with your emails, which further strengthens your credibility.

Overall, inbox warm-ups are designed to ensure that your emails are delivered smoothly and to increase user trust in your emails, thus improving the effectiveness of your foreign trade marketing emails. Therefore, before you launch your first email marketing campaign, it's a good idea to create a brand new mailbox for this purpose and then make sure to warm up your mailbox account.

How to warm up your email account with Geeksend Mailbox Warm Up Tool?

Whether you are new to signing up for an email account or have been using it for a while but have experienced a large number of bounced emails, you need to warm up your email account to improve the situation. It is highly recommended to warm up your mailbox before you actually send marketing emails to your foreign customers. We recommend using an automated mailbox warming tool such as Geeksend Mailbox Warmer.

With simple setup and registration, you can easily complete the entire warming process in just two minutes. I will show you how to optimise your account using the Geeksend Mailbox Warm Up Tool:

Step 1 Set the response rate and campaign deadline for your warm-up campaign emails

After signing up, create a new Geeksend account, add your new mailbox to the warm-up campaign and set the response rate up to 45% only. This is because higher response rates may look suspicious to your ESP.

Then take a few seconds to schedule your campaign - set the warm-up end date and specify the delivery window in which you'd like your emails to be sent.

The longer the warm-up time, the better the results!

Step 2 Select Mailbox Warm-up Policy

If you are using a newly created mail account, the choice is obvious. The progressive strategy is designed for new mailbox accounts to gradually increase the number of emails sent. You can start with 2-5 emails per day and the system will gradually add more and more emails until you reach the maximum sending limit, which is up to 40 emails per day.

The other option - Stabilisation Policy - is designed to improve the deliverability of your existing accounts and repair your domain reputation.

Step 3 Choose your email content type

Now you are faced with another option to choose from. You can choose the content type for your emails - AI-generated or template-specific.

For your first warm-up campaign, I recommend using an AI-generated content type. AI will produce unique simulated email text and create realistic same-threaded dialogue for optimal warm-up results.

Step 4 Check your settings

Now, your warm-up campaign is ready! The last step is to check that all settings are correct.


The Mailbox Warm Up Automation Tool is the fastest and most efficient way to warm up your mailbox account before you start sending marketing emails.

How long does it take to warm up an email account?

It can take some time to warm up an email account and start seeing the results of a marketing email campaign. The length of this time is influenced by a number of factors, including the goals of the campaign, the size of the mailing list, the quality of the leads, the frequency of sending, and most critically, the ESP (Email Service Provider).

Different ESPs may have different stopping times for treating new email accounts as suspicious. Some ESPs may take weeks to establish trust in a new account. In addition, the longer and more fully you invest in maintaining a good sender reputation, the more likely the ESP will trust you.

As a general rule, you should let your email account warm up for at least a week before launching your first email marketing campaign.

If you have a large number of high-quality prospects on your email list, you may need more time to ensure optimal results. We recommend 8-12 weeks of warming up before sending your email campaign. This patient strategy will help ensure that your emails are delivered with the best possible results and feedback at the time of launch.


Important Tips:

1. Be Patient

Firstly, we recommend that you don't send too many marketing emails in a short period of time. If you send large volumes of emails, ESPs may judge you as a spammer and may ban your marketing emails altogether.

2. Keep your customer email list active

Regularly remove contacts who have not opened or clicked on your emails for a period of time, as well as contacts who have unsubscribed or marked your emails as spam.

If you are using an email marketing automation service, you can regularly export your contact lists and remove invalid addresses from them. You can also verify the validity of email addresses in your contact lists with tools such as Geeksend Email Verification.

3. Monitor the credibility of your outboxes

Keep an eye on your sender reputation with tools like Sender Score. It will measure your reputation and provide a score from 0 to 100 (80+ is a good result).


When preparing for your next round of marketing email campaigns, don't be in a hurry and make sure to warm up your inbox first. This step helps to ensure that your emails are sent to exactly the right target audience, thus maximising the chances of potential customers seeing your emails.

With an inbox warming tool like Geeksend, you can complete this process quickly and easily. Of course, you can also choose to do it manually, maintaining a high level of precision and attention to every detail.

By warming up in this way, you can ensure that your email campaigns get off to a successful start, avoid being misdiagnosed as spam or placed in the promotional folder, and thus improve the delivery of your emails.

Geeksend Manager