400 Bad Request from MailChannels

I am following the following blog post in setting up MailChannels: https://blog.bitgate.cz/send-email-at-scale-for-free-with-cloudflare-workers/

I used the following code:

export default {
  async fetch(request, env) {
    if (request.method !== 'POST') {
      return new Response('Method not supported', { status: 405 })
    }

    const token = request.headers.get('Authorization')?.replace('Bearer ', '')
    if (token !== env.TOKEN) {
      return new Response('Unauthorized', { status: 403 })
    }

    const body = await request.json()
    const email_body = {
      personalizations: [{
        to: body.to,
        // dkim_domain: 'example.com',
        // dkim_selector: 'mail1',
        // dkim_private_key: env.DKIM_PRIVATE_KEY,
      }],
      from: body.from,
      subject: body.subject,
      content: body.content,
      // headers: {
      //   'List-Unsubscribe': '<mailto:daniel@example.com?subject=unsubscribe>',
      // },
    }

    const email_request = new Request('https://api.mailchannels.net/tx/v1/send', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(email_body),
    })
    const res = await fetch(email_request)
    return new Response(`${res.status} ${res.statusText}`, { status: res.status })
  },
}

export default {
  async fetch(request, env) {
    if (request.method !== 'POST') {
      return new Response('Method not supported', { status: 405 })
    }

    const token = request.headers.get('Authorization')?.replace('Bearer ', '')
    if (token !== env.TOKEN) {
      return new Response('Unauthorized', { status: 403 })
    }

    const body = await request.json()
    const email_body = {
      personalizations: [{
        to: body.to,
        // dkim_domain: 'example.com',
        // dkim_selector: 'mail1',
        // dkim_private_key: env.DKIM_PRIVATE_KEY,
      }],
      from: body.from,
      subject: body.subject,
      content: body.content,
      // headers: {
      //   'List-Unsubscribe': '<mailto:daniel@example.com?subject=unsubscribe>',
      // },
    }

    const email_request = new Request('https://api.mailchannels.net/tx/v1/send', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(email_body),
    })
    const res = await fetch(email_request)
    return new Response(`${res.status} ${res.statusText}`, { status: res.status })
  },
}

export default {
  async fetch(request, env) {
    if (request.method !== 'POST') {
      return new Response('Method not supported', { status: 405 })
    }

    const token = request.headers.get('Authorization')?.replace('Bearer ', '')
    if (token !== env.TOKEN) {
      return new Response('Unauthorized', { status: 403 })
    }

    const body = await request.json()
    const email_body = {
      personalizations: [{
        to: body.to,
        // dkim_domain: 'example.com',
        // dkim_selector: 'mail1',
        // dkim_private_key: env.DKIM_PRIVATE_KEY,
      }],
      from: body.from,
      subject: body.subject,
      content: body.content,
      // headers: {
      //   'List-Unsubscribe': '<mailto:daniel@example.com?subject=unsubscribe>',
      // },
    }

    const email_request = new Request('https://api.mailchannels.net/tx/v1/send', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(email_body),
    })
    const res = await fetch(email_request)
    return new Response(`${res.status} ${res.statusText}`, { status: res.status })
  },
}

export default {
  async fetch(request, env) {
    if (request.method !== 'POST') {
      return new Response('Method not supported', { status: 405 })
    }

    const token = request.headers.get('Authorization')?.replace('Bearer ', '')
    if (token !== env.TOKEN) {
      return new Response('Unauthorized', { status: 403 })
    }

    const body = await request.json()
    const email_body = {
      personalizations: [{
        to: body.to,
        // dkim_domain: 'example.com',
        // dkim_selector: 'mail1',
        // dkim_private_key: env.DKIM_PRIVATE_KEY,
      }],
      from: body.from,
      subject: body.subject,
      content: body.content,
      // headers: {
      //   'List-Unsubscribe': '<mailto:daniel@example.com?subject=unsubscribe>',
      // },
    }

    const email_request = new Request('https://api.mailchannels.net/tx/v1/send', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(email_body),
    })
    const res = await fetch(email_request)
    return new Response(`${res.status} ${res.statusText}`, { status: res.status })
  },
}

The request from mailchannels keeps returning with "400 Bad Request".

I did create the create the Domail Lockdown as mentioned here: https://support.mailchannels.com/hc/en-us/articles/16918954360845-Secure-your-domain-name-against-spoofing-with-Domain-Lockdown-

Would anyone have any suggestions on getting this to work?

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400 Bad Request from MailChannels

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