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

# Connecting to Instantly

> How to add TenantCore-provisioned mailboxes to Instantly using mailbox credentials.

## Overview

TenantCore does not connect to Instantly directly. The integration happens at the mailbox level — you retrieve credentials from TenantCore and enter them into Instantly as email accounts.

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## Prerequisites

* At least one mailbox provisioned in TenantCore with a **Verified** domain status
* An Instantly account with available email account slots

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## Step 1 — Retrieve Mailbox credentials from TenantCore

1. Open the TenantCore app and navigate to the **Mailboxes** page
2. Find the mailbox you want to connect
3. Copy the credentials

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## Step 2 — Add the email account in Instantly

1. In Instantly, go to **Accounts**
2. Click **Add Account** and select **Outlook** or **Microsoft 365**
3. Sign in with your Outlook credentials and click **Accept** when asked for permissions. This utilizes secure OAuth.
4. Once the status shows **Connected**, your mailbox is ready for warm-up or campaigns.

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## Step 3 — Configure send limits in Instantly

<Warning>
  Set your Instantly per-account send limit **at or below** the limit enforced in TenantCore. If Instantly attempts to exceed the TenantCore limit, Exchange will block the excess messages and Instantly may log delivery errors.
</Warning>

In Instantly, open the account settings and configure:

* **Daily email limit** — match this to the TenantCore mailbox limit or set it lower
* **Sending window** — spread sends across business hours; avoid scheduling bursts

The TenantCore limit is the hard ceiling. Instantly's limit controls scheduling. Keeping them aligned avoids NDRs and error flags in Instantly's account health dashboard.

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## Repeat for each mailbox

Add each TenantCore mailbox as a separate account in Instantly. Use Instantly's account grouping or tagging to keep client mailboxes organized if you are managing multiple clients.

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## Troubleshooting

**Connection fails**

* Confirm the mailbox password was copied correctly — passwords are case-sensitive
* Confirm the domain shows as **Verified** in TenantCore before attempting to connect
* Confirm the mailbox status is **Active** in TenantCore

**Delivery errors after connecting**

* If messages are being blocked, the Instantly send limit likely exceeds the TenantCore mailbox limit
* Reduce Instantly's daily email limit to match or fall below the TenantCore limit