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How Do I Add My Inboxes to ListKit's Email Engine?

Written by Said Jrad
Updated over a week ago

THIS ARTICLE IS FOR: ✅ Self-Serve
Stage: Onboarding / Live
Owner: OB
Last updated: 2026-02-20
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TL;DR

  • You must connect inboxes before launching any campaigns.

  • Go to Email Engine → Inboxes.

  • Choose one of four connection methods (CSV, Google Workspace, Office 365, IMAP).

  • Once added, inboxes are ready for campaigns and the Master Inbox.
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Why this matters

Inboxes are the foundation of your Email Engine.
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Without connected sending inboxes, you cannot launch campaigns, send emails, or use the Master Inbox.
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Step 1: Access the Inboxes tab

  1. Go to next.listkit.io and Login

  2. Click Email Engine → Inboxes

You should now see the Inboxes page, where you can connect your sending accounts.
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Step 2: Choose how you want to add inboxes

Inside the Inboxes tab, you’ll see four connection options:

  • CSV Bulk Email Addition

  • B2B Google Workspace

  • B2B Office 365

  • Other B2B Provider (IMAP)

Choose the option that matches your email provider.


Option 1: Add inboxes using CSV (bulk upload)

Best for adding multiple inboxes at once.
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How to upload via CSV

  1. Click CSV Sample to download the required format.

  2. Follow the exact structure shown in the sample file.

  3. Click Upload.

  4. Select your completed CSV file.

  5. Click Continue.

The system will begin importing your inboxes.

What happens after upload?

You’ll see a summary screen showing:

  • ✅ Successfully added inboxes

  • ⚠️ Skipped inboxes (already exist)

  • ❌ Failed inboxes (errors in setup)

Review the results carefully.

Once complete, click:

👉 Go to Inboxes

You should now see all successfully imported inboxes listed.


Option 2: Add inboxes via Google/GSuite

If you use Google/GSuite:

  1. Click Connect under Google

  2. Follow the authentication prompts

  3. Authorize ListKit to access the selected inboxes

After approval, your inboxes will appear automatically in the Inboxes tab.
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Option 3: Add inboxes via OutLook

If you use Hotmail, Live, MSN:

  1. Click Connect under Outlook

  2. Complete login and authorization

  3. Approve inbox access

Once authenticated, inboxes will be added automatically.
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Option 4: Add inboxes via IMAP (Other B2B Provider)

If you use another business email provider:

  1. Click Other B2B Provider (IMAP)

  2. Enter your IMAP configuration details

  3. Complete the connection process

Once verified, the inbox will appear in the Inboxes tab.
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Expected outcome

You should now see your connected inboxes listed inside the Inboxes tab.

They are now:

  • Ready to be Warmed up

  • Ready to be Edited

  • Connected to the Email Engine
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Troubleshooting / FAQs

Why can’t I launch a campaign?
You likely haven’t added any inboxes yet. Campaigns require at least one connected sending inbox.
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Why was my inbox skipped?
It already exists in the system.
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Why did my inbox fail to import?
There may be formatting issues in your CSV or incorrect credentials.
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Can I mix connection methods?
Yes. You can add some inboxes via Google Workspace and others via CSV or IMAP.

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