Supported API headers
Infobip Email API supports standard and custom headers to improve delivery and compliance.
| Header | Description |
|---|---|
List-Unsubscribe | Required for compliance. Adds unsubscribe link or email address. |
Reply-To | Defines reply-to address. |
Return-Path | Handles bounces and delivery failures. |
Message-ID | Custom unique ID for tracking. |
X-Custom-* | Add your own custom headers for integration needs. |