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Receiving emails contain the HTML and Plain Text body of the email, as well as the headers.
Webhooks do not include the email body, headers, or attachments, only their metadata. You must call the Received emails API or the Attachments API to retrieve them. This design choice supports large attachments in serverless environments that have limited request body sizes.
After receiving the webhook event, call the Receiving API. Here are some examples: 
// app/api/events/route.ts
import type { NextRequest } from 'next/server';
import { NextResponse } from 'next/server';
import { Resend } from 'resend';

const resend = new Resend('re_xxxxxxxxx');

export const POST = async (request: NextRequest) => {
  const event = await request.json();

  if (event.type === 'email.received') {
    const { data: email } = await resend.emails.receiving.get(
      event.data.email_id,
    );

    console.log(email.html);
    console.log(email.text);
    console.log(email.headers);

    return NextResponse.json(email);
  }

  return NextResponse.json({});
};