How do I pause or deactivate an inbox?

THIS ARTICLE IS FOR: All ListKit customers
​Stage: Onboarding / Optimization
​Owner: CS
​Last updated: July 2026
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There are two situations where you might want to stop an inbox from sending, temporarily resting it, or permanently removing it because it is no longer performing. Knowing the right action for each situation protects your campaigns and your sender reputation.
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If you want to stop a specific inbox from sending without deleting it, remove it from the campaigns it is assigned to. This is done from inside your campaign settings.

Go to Email Engine in the left sidebar and click Campaigns. Open the campaign the inbox is assigned to and navigate to the campaign's settings by clicking on the 3 dots, then edit, and on step number 3 (Campgain Setup), you can set the Inboxes that are sending, remove the ones with bad reputation.
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This is the right approach when you want to rest an inbox temporarily, investigate a deliverability issue, or rotate a different inbox into a campaign without losing the inbox permanently.
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If an inbox is burnt, underperforming, or no longer needed, you can delete it permanently from the Inboxes tab inside Email Engine.

Go to Email Engine in the left sidebar and click Inboxes. Find the inbox you want to remove, click the three dot menu on the right side of the row, and select Delete.

This action is permanent and cannot be undone. Only delete an inbox when you are sure it is no longer useful, a burnt inbox, a duplicate, or one that has been replaced.
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The reputation score is your main signal. Every inbox in Email Engine displays a reputation score that reflects its current sender health.

A healthy inbox sits at or close to 100%. If you notice an inbox's reputation score dropping significantly and it is not recovering, that is a sign the inbox may be burnt and should be removed and replaced.
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If you are unsure whether an inbox is burnt or just temporarily underperforming, reach out to support via Intercom chat or at [email protected] before deleting it. The team can review the inbox health and advise on the right course of action.
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Warmup should always stay on, for every inbox, at all times, regardless of whether the inbox is assigned to an active campaign or not. Warmup running in the background is what maintains your sender reputation over time, not just builds it during the initial setup period.
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Do not turn warmup off as a way of pausing an inbox. If you want to stop an inbox from sending, remove it from your campaigns. Warmup and sending are completely independent of each other.
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Removing an inbox from a campaign stops it from sending immediately while keeping it healthy and ready to be re-added later. Deleting an inbox removes it permanently and frees up your setup for a replacement. In both cases, your other inboxes and campaigns continue running without interruption.
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Does removing an inbox from a campaign affect warmup?
No. Warmup runs independently of campaign assignment. An inbox that is not assigned to any campaign will continue warming up in the background.
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Can I re-add an inbox to a campaign after removing it?
Yes. Removing an inbox from a campaign does not delete it. You can re-assign it to any campaign at any time from inside the campaign settings.
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What reputation score should I be concerned about?
A healthy inbox sits at or close to 100%. If you notice a significant and sustained drop in reputation score that is not recovering, reach out to support before taking any action.
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Can I recover a burnt inbox instead of deleting it?
Reach out to [email protected] before deleting. The team will review the inbox health and advise on whether recovery is possible or whether deletion and replacement is the right move.
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What happens to my campaigns if I delete an inbox that was assigned to them?
Reach out to [email protected] to confirm before deleting any inbox that is currently assigned to an active campaign.