Connect Mission Inbox OBM API to SuperSend

Purpose

The Mission Inbox OBM (Outbound Mail) API enables high-volume sending through Mission Inbox's managed infrastructure. This article walks through connecting your Mission Inbox API to SuperSend, syncing domains, creating send-as mailboxes, and configuring reply routing so you can run campaigns at scale with full Super Inbox support.

Prerequisites

• A Mission Inbox account with at least one domain configured
• Your Mission Inbox API key (from Mission Inbox → Settings → Platform API)
• Org admin permissions in SuperSend

Step 1: Get Your Mission Inbox API Key

1. Log in to Mission Inbox
2. Go to Settings → Platform API
3. Find your API key and copy it

Step 2: Connect Mission Inbox in SuperSend

1. Log in to SuperSend
2. Go to Admin → Integrations
3. Select your team from the dropdown
4. In the Sending Providers section, find MissionInbox
5. Click Manage → Add Account
6. Paste your API key and save

Domains sync automatically — Within about 5 minutes, all domains from your Mission Inbox account will appear in SuperSend. You can then create send-as mailboxes on those domains.

Step 3: Add OBM API Senders

You can add senders in two ways: single sender or bulk import via CSV.

Option A: Add a Single Sender

1. Go to Senders → Add Sender → Email Sender
2. Click Connect Your Own Mailboxes
3. Find Mission Inbox OBM API under "Email API Providers" and click it
4. Enter:

• API Key — your Mission Inbox API key (or use the one from Admin → Integrations if connected)
• Send As Email — an email address using a domain synced from your Mission Inbox account (e.g. curtis@meet.teamsupersend.com)
• Reply-To Email — where replies should be directed (for Super Send reply routing, use an address that routes to SuperSend)
• Track Replies — enable if your Mission Inbox plan supports reply detection

5. Click Connect

Option B: Bulk Import via CSV

1. Go to Senders → Add Sender → Email Sender
2. Click Connect Your Own Mailboxes
3. Select Mission Inbox OBM API (or Mission Inbox bulk import option if available)
4. Click Bulk import via CSV
5. Download the CSV template and fill in:

• email — email address (must use a synced domain)
• send_as — display name
• reply_to — reply-to address for Super Send reply routing
• global_max_per_day — daily send limit (e.g. 25)

6. Upload the completed CSV

Typical setup for ~500 cold emails/day: Configure about 16–17 senders with a global max of ~25 emails per day each. Mission Inbox allows up to 500 cold production emails per day; this spread keeps you within that limit.

Step 4: Configure Reply Routing via Inbound Webhook

To receive replies in Super Inbox (enabling auto-pause, unsubscribe handling, and reply detection), configure the inbound webhook in Mission Inbox:

1. Go to Mission Inbox API Sending
2. Click the Inbound webhook tab
3. Enter the following webhook URL:

   https://api.supersend.io/v1/mailbox/webhook/missioninbox/inbound

4. Click Save

Once saved, replies to your OBM API senders will automatically appear in Super Inbox within SuperSend.

Step 5: Attach to a Sender Profile

After adding OBM senders, attach them to a sender profile so campaigns can use them:

1. Go to Senders → Sender Profiles tab
2. Open a profile (or create one)
3. Click Add Mailboxes and select the Mission Inbox OBM senders
4. Save

See Create and Use Sender Profiles for details.

Step 6: Ramp Up (Recommended)

Mission Inbox recommends ramping up new infrastructure gradually. On each sender, configure ramp-up in the Limits tab:

• Example: If your target is 25 emails per day, set a ramp-up of 5 emails over 14 days
• SuperSend will start at 5/day and increase over 14 days until you reach 25/day

Expected Result

Mission Inbox OBM API senders are connected, domains are synced, send-as mailboxes are created, and reply routing is configured. Senders appear in Senders → Mailboxes and can be attached to sender profiles for campaign use.

Troubleshooting

• Issue: Domains don't sync after adding the integration.

Fix: Verify the API key is correct. Allow 5 minutes for sync, then refresh. Check that your Mission Inbox account has domains configured.

• Issue: OBM API sender connected but emails aren't going out.

Fix: Verify the sending domain is verified and active in your Mission Inbox account. Confirm the sender profile is assigned to the campaign. Check that you're within Mission Inbox daily limits.

• Issue: Replies aren't appearing in Super Inbox.

Fix: Confirm the inbound webhook is configured in Mission Inbox. Go to v4.missioninbox.com/api-sending → Inbound webhook tab and verify the URL is set to https://api.supersend.io/v1/mailbox/webhook/missioninbox/inbound.

Related Articles

• Mission Inbox Integration Setup
• Connect Mission Inbox Senders
• Create and Use Sender Profiles

Updated on: 06/04/2026