tool · inferred from evidence
cid
Content-ID (cid), a mechanism for embedding images inline in email HTML.
- How to embed images inline via cid in Resend emails
CID embedding is supported in resend 4.8.0 and later via the inlineContentId attachment property. Reference the attachment in your HTML with an image tag whose source is the cid: scheme plus your content id. In the send call, pass from, to,