Connect Mailgun to Boxset: Step-by-Step Setup Guide

What You'll Need

• A Mailgun account with at least one verified sending domain
• Access to your Boxset dashboard (Integrations section)
• Admin access in Mailgun to create API keys and configure webhooks

Part 1: Connect Mailgun to Boxset

Part 2: Set Up Event Tracking (Webhook)

Troubleshooting

"Invalid API key" error

• Make sure you're using the Private API key, not the public validation key
• Check your Mailgun region setting in Boxset matches your account (US vs EU)
• EU accounts use api.eu.mailgun.net — selecting the wrong region will cause authentication failures

"Invalid signature" on webhooks

• Mailgun uses a Webhook Signing Key that is separate from your API key
• Find it in Mailgun Dashboard → Settings → API Security → HTTP Webhook Signing Key
• Update your Boxset connection and paste the signing key in the Signing Key field
• If you don't provide a signing key, Boxset accepts webhooks using URL-based security (the unique connection ID in your webhook URL)

Webhooks not delivering events

• Verify the webhook URL is correct for each event type
• Mailgun configures webhooks per domain — make sure you've set up the correct domain
• Use Mailgun's Test Webhook button to diagnose connection issues
• Check Mailgun's Logs section for webhook delivery failures

Getting events from only some domains

• Each Mailgun domain needs its own webhook configuration
• Go to Sending → Webhooks and switch between domains using the dropdown to configure each one