High-volume senders
Mailgun
Sending through Mailgun with EU or US region and signed event webhooks.
- Connection
- API key
- Direction
- send
- Plan
- Business or Agency
What works
- Sending via the Mailgun API (EU region option)
- Bounce and complaint webhook with HMAC verification
Limitations
- Send-only
- Threading header `References` is not sent through Mailgun (known defect BX-05)
- Requires the high-volume providers feature
Requirements
- Mailgun API key and domain
- Business or Agency plan
Source: docs/INTEGRATIONS.md §1.1, §5. Last tested 2026-11-04.
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