Master Inbox
Integrations and Webhooks

Add an Integration

In this guide, you'll learn what integrations are, why they matter, how to connect individual tools, how to use bulk integration, and best practices for labels and CSV uploads.

What is an Integration?

An integration connects Master Inbox with the tools you already use for outreach, CRM, and notifications. Instead of checking multiple platforms for replies, integrations pull everything into one place so your team can see, reply, and act faster.

Without Integrations

  • Replies stay scattered across tools

  • Messages get missed

  • Teams jump between platforms constantly

  • Follow-ups fall through the cracks

With Integrations

  • All replies appear in one inbox

  • LinkedIn and email conversations are unified

  • Alerts trigger automatically

  • CRMs stay in sync

Think of it this way: Your tools send messages. Master Inbox captures replies. Integrations bridge the gap between them.

What You'll Need

Most integrations require one or more of the following credentials. Have these ready before you start.

Authentication

  • API Key / API Secret

  • Account or Workspace ID

Configuration

  • Labels or Tags (e.g. DNC, Warm-up)

  • Webhook URL (for real-time updates)

These credentials let Master Inbox securely communicate with each connected tool.

Steps to set Integration:

  1. Go to Workspace Settings

  2. Click on Integrations

Integration settings page

  1. Select the tool you want to connect

  2. Enter the required credentials. For Example: API key, API Secret, DNC Equivalent Labels etc

Integration credentials form

  1. Click Save

  2. You can also choose Bulk Integration by providing all the credentials.

What Is Bulk Integration?

Instead of connecting one inbox at a time, Bulk Integration lets you connect multiple outreach tools in a single flow.

Think of it this way: one workspace → many sender identities. Bulk Integration is how agencies connect everything at scale without repetitive manual setup.

Bulk Integration allows you to:

  • Connect multiple outreach tools in one flow

  • Apply labels automatically

  • Assign accounts to the right workspace

  • Avoid repetitive manual setup

Supported Tools for Bulk Integration

Bulk Integration currently supports:

Email Bison

Used for agencies running white-labeled or privately hosted email sequencing.

Required fields:

  • EmailBison API Key

  • EmailBison API URL

  • Labels (to organize replies inside Master Inbox)

Once connected, all replies from EmailBison mailboxes sync automatically.

HeyReach

Used to sync LinkedIn conversations and reply directly from Master Inbox.

Required fields:

  • HeyReach API Key

  • Select LinkedIn accounts to connect

This pulls LinkedIn replies into the same inbox as your email replies.

SmartLead.ai

Used mainly for email warm-up, deliverability control, and scaling cold email campaigns.

Required fields:

  • Smartlead API Key

  • Select Client

  • Select Label(s)

Warm-up or excluded emails can be automatically filtered out of your inbox.

Instantly.ai

Used for scaling cold email campaigns and managing warm leads.

Required fields:

  • Instantly API Key

  • Select Label(s)

Replies sync automatically and appear in real time.

Why Labels Matter During Setup

Always assign labels during bulk setup — not after. Skipping this step means manual cleanup later and risks replies routing to the wrong place.

Labels help you:

  • Separate clients from each other

  • Filter warm vs cold replies

  • Route conversations to the right team

  • Trigger automations or webhooks

CSV Uploads

Some providers allow you to export sender accounts via CSV and upload them directly into Master Inbox.

Typical CSV fields include:

  • Email address

  • Account ID

  • Provider name

  • Client or campaign name

Common CSV errors to watch for:

  • Missing headers

  • Extra spaces in fields

  • Incorrect email formats

  • Unsupported export structure

If an upload fails, check your formatting carefully before retrying.

CSV Best Practices

  • Export directly from the provider dashboard — don't reconstruct manually

  • Avoid editing CSVs in tools that auto-format (like Excel) unless necessary

  • Keep one client per file when possible

  • Use clear, consistent naming conventions across files

Complete The Setup

Once all required fields are filled:

  1. Review your selected accounts and labels.

  2. Click Save Integration.

That's it. Your mailboxes or LinkedIn accounts will start syncing replies into Master Inbox automatically — no further configuration needed.

Explore integration guides:

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