AWS Lambda

npm install lettr

import { Lettr } from 'lettr';

const lettr = new Lettr(process.env.LETTR_API_KEY);

export const handler = async (event) => {
  try {
    // Parse request body (API Gateway proxy integration)
    const body = JSON.parse(event.body || '{}');
    const { to, subject, html, text } = body;

    // Validate required fields
    if (!to || !subject || (!html && !text)) {
      return {
        statusCode: 400,
        body: JSON.stringify({
          error: 'Missing required fields: to, subject, and html or text',
        }),
      };
    }

    // Send email via Lettr
    const result = await lettr.emails.send({
      from: process.env.FROM_EMAIL || 'noreply@yourdomain.com',
      to: Array.isArray(to) ? to : [to],
      subject,
      html,
      text,
    });

    console.log(`Email sent successfully. Request ID: ${result.request_id}`);

    return {
      statusCode: 200,
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        success: true,
        requestId: result.request_id,
        accepted: result.accepted,
      }),
    };
  } catch (error) {
    console.error('Failed to send email:', error);

    return {
      statusCode: error.status || 500,
      body: JSON.stringify({
        error: error.message || 'Internal server error',
      }),
    };
  }
};