> ## 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.

# Sending limits

> Understand mailbox capacity, warmup, and queued emails.

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## Overview

A mailbox's send limit controls how many emails Unify can send from it in
24 hours. All sequences using that mailbox share its capacity. The sequence's
[send schedule](/reference/sequences/send-schedules) determines when those
emails may send.

New Unify-managed mailboxes default to 25 sends per day. New connected work
mailboxes default to 50. Existing mailboxes can have different limits, so check
the value in mailbox settings when planning outreach.

## Set a mailbox's limit

A workspace administrator can change mailbox limits. Where your workspace
allows users to adjust their own limits, the maximum is bounded by the
administrator's setting.

<Steps titleSize="h3">
  <Step title="Open the mailbox">
    Go to [Settings → Mailboxes](https://app.unifygtm.com/dashboard/settings/deliverability/mailboxes)
    and select the sending address.
  </Step>

  <Step title="Adjust the limit">
    Under **Advanced**, set the **Mailbox send limit**, then click **Save**.
    The setting shows whether this mailbox overrides the workspace default.
    The standard maximum is 150 sends per 24 hours.

    <ThemedImageFrame lightSrc="/images/reference/deliverability/mailbox-send-limits-light.png" darkSrc="/images/reference/deliverability/mailbox-send-limits-dark.png" alt="Mailbox details showing the send limit and its relationship to the workspace default." />
  </Step>
</Steps>

Administrators can review the workspace default in
[Settings → Sequences](https://app.unifygtm.com/dashboard/settings/features/sequences)
under **Deliverability**. Raising a limit increases potential volume. Consider
the mailbox's history, recipient quality, and recent delivery results before
making a change.

## Warmup and ramp-up

Warmup prepares a new Unify-managed mailbox for outreach. Allow about three
weeks and review the estimated completion date in mailbox settings. Unify
manages this process and its ongoing deliverability work.

Ramp-up gradually increases a mailbox's sending capacity toward its configured
limit. Where ramp-up is enabled, a new mailbox starts at zero, while an existing
mailbox starts from its previous daily limit. Capacity increases by five sends
per day until it reaches the configured limit. Increasing the maximum can
restart ramp-up.

The warmup status helps explain the mailbox's current readiness:

| Status | Meaning |
| - | - |
| Warming | The mailbox is completing warmup before normal outreach. |
| Ramping | The mailbox's current sending capacity is increasing toward its limit. |
| Warm | The mailbox has completed warmup. Its send limit and sequence schedule still apply. |

Check the current daily send limit when it is shown. A mailbox ramping toward
25 sends per day may have less capacity today.

## Understand the queue

Enrolling someone in a sequence schedules their work. An email becomes eligible
to send after its preceding steps and delays, during an allowed sending window,
and when the mailbox has capacity. Follow-up emails use capacity alongside
first touches.

For example, two sequences sharing a mailbox with a limit of 25 sends per day
share those 25 sends. A [mailbox group](/reference/deliverability/mailbox-groups)
can distribute new enrollments across several mailboxes.

For a delayed email, check the enrollment's status, the next step and its
schedule, then the sending mailbox's status and capacity. An email awaiting
manual approval also needs the assigned user to complete that step. See
[blocked enrollments](/reference/sequences/enrollments#resolve-blocked-enrollments)
for recovery instructions.

Use the [Email backlog dashboard](/reference/insights/email-backlog) to compare
queued email with sending capacity across your workspace and find mailboxes
that need attention.

## Protect deliverability

Use limits that fit your outreach and the mailbox's readiness. For connected
work mailboxes, also consider email sent directly and through other tools.
Review bounces and replies as volume changes, and contact Unify support if
Unify-managed mailboxes develop persistent delivery problems.


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