> ## Documentation Index
> Fetch the complete documentation index at: https://docs.unifygtm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Email backlog

> Compare queued email with available sending capacity.

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## Overview

<PlanAvailability plans="Business" />

The email backlog dashboard helps you identify when queued email exceeds your
mailboxes' sending capacity. Use it to find overloaded mailboxes and decide
whether to redistribute enrollments or add capacity. Open
[**Insights → Email backlog**](https://app.unifygtm.com/dashboard/analytics/leading/email-backlog).

<ThemedImageFrame lightSrc="/images/reference/insights/insights-backlog-light.png" darkSrc="/images/reference/insights/insights-backlog-dark.png" alt="The email backlog dashboard showing no queued emails and available daily sending capacity." />

## Read backlog health

The summary brings together the queue and the capacity available to send it:

| Measure | Meaning |
| - | - |
| Time to clear backlog | The longest clearance time across mailboxes, calculated from each mailbox's backlog and daily limit. |
| Total emails in backlog | Pending, unblocked email waiting to send from eligible mailboxes. |
| Total daily email sends | Active daily sending capacity compared with total available capacity. |
| Total mailboxes in use | Mailboxes used for active enrollments compared with available mailboxes. |

Each mailbox's clearance estimate is rounded up to whole days. For
example, a mailbox with 120 queued emails and a daily limit of 50 contributes a
three-day estimate. New enrollments, send schedules, and changes in mailbox
availability can change how long sending actually takes.

The dashboard marks one day or less as healthy, two to four days as a warning,
and five or more days as critical. Review the affected mailboxes as the estimate
grows.

## Compare demand and capacity

Choose a date preset to review backlog trends. The charts compare queued email
and new email added to the backlog with active and total sending limits. A gap
between active and total capacity can indicate available mailboxes that your
current enrollments are not using.

Before increasing a limit, review [sending limits and warmup](/reference/deliverability/sending-limits).
An email can also be waiting on approval, an enrollment condition, or a send
schedule. Inspect the [enrollment](/reference/sequences/enrollments) when a
specific message is delayed.

## Resolve a capacity shortage

Below the charts, the dashboard groups options under **Actions to resolve
backlog issues**. Choose the action that fits the affected workflows:

* **Create more mailboxes:** review mailboxes with high volume and add sending capacity if the existing mailboxes are fully used. Allow new mailboxes to complete warmup before relying on them for outreach.
* **Use mailbox groups:** distribute new enrollments among the eligible mailboxes in a [mailbox group](/reference/deliverability/mailbox-groups). Review the group's membership and where plays use it.
* **Reassign sequence enrollments:** find sequences with queued enrollments and use **Reassign enrollments** to open their reassignment flow. Review the selected enrollments and destination sender before confirming.

Refresh the dashboard after making changes and check the affected enrollments.
For connection failures or mailbox status issues, see
[Mailbox operations](/reference/deliverability/mailbox-operations).


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