When you connect an inbox to our tool, it´s not automatically released to the inbox network, but firstly, it goes to the testing environment, where we check if your inbox can receive emails without any issues.

Our automation sends several testing emails to your inbox, and then logs into your inbox and searches for them. This takes about 1 hour, and then:

- If it can find these emails, your inbox is released to the actual inbox network, and the email warmup starts.

- If it fails to find these emails, your inbox errors as undeliverable.

- You don´t have the DNS (SPF, DKIM, DMARC) or MX records in place.

- You set up a rule to automatically delete these emails. In such a case, our automation won´t be able to find these emails and will consider your inbox undeliverable.

- You have an email forwarding turned on, meaning that every incoming email to your inbox is automatically forwarded somewhere else. In such a case, our automation won´t be able to locate the incoming warmup emails in your inbox.

Once your inbox is released from this testing environment, the warmup activity works, and you will see the first emails sent in the Warmup Inbox dashboard.

If your inbox is running without any issues, you will see the sent emails in the inbox dashboard, including these stats:

How this tool works is that once you connect the inbox, it will automatically send emails to other users in the Warmup Inbox. Based on your sending frequency, daily, you will send a certain volume of emails. You can see these stats in the inbox´s dashboard in Warmup Inbox as well.

At the same time as you´re sending emails, you are receiving emails from other users who are warming up their inboxes. All these emails contain your unique ID, and there´s no need to manually reply to these emails. You can simply create a folder and set up a filtering rule for them. To do so, please follow these instructions:

https://help.warmupinbox.com/en/articles/10599985-how-to-filter-the-incoming-emails

We also have an automation in place that deletes all sent warmup emails from your sent folder every 24 hours.

Every time your emails land in spam or promotions, we pull this email out and place it within the main inbox of the recipient to indicate to the provider it was misidentified as spam, so over time, these interactions help you to build up a positive sender history.

For the best results, we recommend keeping the default sending frequency or configuring a gradual daily increase in the number of warmup emails sent.

Sending a high volume of emails from a newly created inbox can do more harm than good. Since a new inbox has no established sending reputation, email service providers may view a sudden spike in sending activity as suspicious behavior and potentially classify the sender as spam.

Email warmup is designed to be a slow, consistent process. Email service providers evaluate inbox reputation based on long-term sending patterns and engagement signals. A gradual increase in email volume helps demonstrate legitimate and trustworthy sending behavior over time.

Increasing the sending volume too aggressively at the beginning will not accelerate the reputation-building process. In many cases, it can have the opposite effect and negatively impact your inbox's deliverability.

Seeing a higher volume of warmup emails landed in spam during the first days of email warmup is typically normal and nothing to worry about. Our automation is pulling all these emails out of spam, and over time, you will see fewer and fewer emails landing in spam.

However, to be 100% sure there are no issues with your inbox, you should always check if:

To do so, you can use these free tools:

To check SPF

To check DMARC

To check DKIM

To do so, you can use this free tool.