What's the recommended approach for sending transactional emails (e.g., password resets) using a Cloudflare Worker?

For transactional emails, integrate your Cloudflare Worker with a dedicated transactional email service like SendGrid, Mailgun, Amazon SES, or Postmark. The worker should trigger the email sending through the API of the chosen service. This offloads email delivery to a provider specializing in deliverability and provides robust tracking and analytics.