@upyo/mime

@upyo/mime

This package is introduced in Upyo 0.6.0.

Portable MIME composition and DKIM signing for Upyo. Compose a structured message without a transport connection, then save its bytes or pass it to sendRaw() on an SMTP or JMAP transport.

import { createMessage, readAttachmentContent } from "@upyo/core";
import { composeMessage } from "@upyo/mime";

const composed = await composeMessage(createMessage({
  from: "sender@example.com",
  to: "recipient@example.com",
  subject: "Hello",
  content: { text: "Hello!" },
}));
const eml = await readAttachmentContent(composed.content);

See the MIME composition guide for streaming, signing, cancellation, and attachment lifetime. Runtime code uses web APIs and works without Node.js compatibility in edge environments.