Send Gmail with Inline Embedded Image via API

This n8n workflow enables sending Gmail messages with inline embedded images, overcoming the limitation of the built-in Gmail node which doesn't support image embedding in the email body. It uses an HTTP Request node to interact directly with the Gmail API, constructing a raw multipart/related MIME email that includes the HTML body and a base64-encoded image attached inline via Content-ID.

The process starts with a manual trigger, followed by setting message parameters (from, to, subject, body HTML). An image is fetched (e.g., from URL or previous node), converted to base64, and packaged into the MIME structure with boundaries. The composed raw email is then POSTed to the Gmail API endpoint 'https://www.googleapis.com/gmail/v1/users/me/messages/send'.

Benefits include creating rich, professional emails with embedded charts, logos, or screenshots without external links, improving deliverability and user experience. It's ideal for automated reports, notifications, marketing emails, or dashboards shared via email. Requires Gmail API credentials with send permissions, saving hours of manual coding or third-party tools.

Use cases: Daily sales reports with graphs, customer invoices with logos, automated alerts with screenshots, or personalized newsletters with product images. Highly customizable for dynamic content from other n8n nodes like charts or AI-generated visuals.