In this article, you’ll learn about mailbox warm-ups (aka warm-up slots), or how many email accounts you can warm-up and how many warm-up emails you can send.
Depending on your current pricing plan, you can start a warm-up for a certain number of email accounts at the same time (mailbox slots) and send a certain number of warm-up emails from each connected mailbox per day.
How do warm-up slots work
If we think of the Email Warm-up as a fireplace that can accommodate a fixed number of mailboxes at once, the warm-up slot is like a seat near the fireplace.
When you add your email address to a warm-up, it takes a seat (aka warm-up slot) and stays there during the warm-up campaign.
If you remove this email address from the warm-up, the slot becomes vacant and you can place another email account to that slot.
The number of warm-up slots you have depends on your plan and means how many email accounts you can warm up at the same time.
What are warm-up volume limits
The Email Warm-up lasts until it sends a fixed number of emails per day for every slot.
If you replace or re-add the email account in the warm-up slot during the day, the volume limit does not reset.
As your plan gets higher, the warm-up lasts longer with more emails sent and more slots are added.
The following table shows each pricing plan's warm-up capabilities.
| Plan | Trial | Starter | Pro 5K | Pro 20K | Pro 50K | Pro 100K |
| Warm-up slots available | 1 | 3 | unlimited | unlimited | unlimited | unlimited |
| Maximum warm-up limit per day (sending goal) | 15 | 50 | 100 | 200 | 500 | 1000 |
The Trial plan allows you to send up to 450 warm-up emails for free. This limit does not automatically renew when your free plan extends to the next month. Upgrade your account to premium to continue the warm-up with increased limits.
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