Connect Your Mailboxes from InboxKit to MasterInbox: Everything You Need to Know

InboxKit allows you to seamlessly connect your mailboxes to Master Inbox so you can automate outreach without any manual setup. This guide covers how to connect Master Inbox, configure exports, enable Auto-Export, and troubleshoot common issues.

Part 1: Connect Master Inbox to InboxKit

Follow these steps to integrate your Master Inbox account:

Step 1: Go to Sequencers

• From your InboxKit dashboard, navigate to Sequencers (left sidebar).

• Click + Add Sequencer.

Step 2: Select Master Inbox

• Choose Master Inbox from the list of available platforms.

• You will see required fields: Email, Password, and Workspace.

Step 3: Enter Your Master Inbox Credentials

Fill in the following:

• Email – the same email you use to log into Master Inbox

• Password – your Master Inbox login password

Click Validate Credentials to verify your login details.

Step 4: Select Your Workspace

Once your credentials are validated:

• A Workspace dropdown will appear showing all available workspaces from your Master Inbox account

• Select the workspace where you want to export your mailboxes

Finally, click Connect Master Inbox. Your sequencer will now appear in the Sequencers list with a connected status.

Part 2: Export Your Mailboxes to Master Inbox

After connecting Master Inbox, you can export mailboxes manually or automatically.

Manual Export

1. Go to Exports in InboxKit.

2. Click Create Export.

3. Choose Master Inbox as your sequencer.

4. Select the mailboxes you want to export.

5. Click Create Export Job.

Exporting usually completes within 5–30 minutes. Once done, your mailboxes will appear inside Master Inbox under your sending accounts.

Auto-Export (Recommended)

InboxKit also supports Auto Export, which saves you time.

When enabled:

• New mailboxes you purchase and activate will automatically sync to Master Inbox.

• No need to manually trigger exports every time you scale.

To turn it on:

• Go to Sequencers → Master Inbox → Settings

• Enable Auto Export

Export Failures: Common Reasons & Fixes

If your export fails, it is usually due to one of the following:

1. Incorrect Credentials

Ensure:

• Your Master Inbox login email is correct

• Your Master Inbox password is correct

• Your Workspace selection is valid

2. Credential Validation Failed

If the Validate Credentials step fails:

• Double-check your email and password

• Ensure your Master Inbox account is active

• Try logging into Master Inbox directly to confirm credentials work

3. Subscription Expired in Master Inbox

You must have an active Master Inbox subscription. If the subscription is inactive, export will fail.

4. Two-Factor Authentication Enabled (2FA)

Master Inbox does not support API login or mailbox sync with 2FA enabled. Disable 2FA temporarily from Master Inbox settings.

5. Master Inbox Account Limits

If your Master Inbox plan has reached mailbox or workspace limits, new mailboxes cannot be added. Upgrade your plan or remove unused mailboxes.

You're All Set

Once connected and exported, your mailboxes will be ready for sending campaigns inside Master Inbox—fully warmed, authenticated, and optimized by InboxKit.