klz-cables.com/lib/mail/mailer.ts

import nodemailer from "nodemailer";
import { render } from "@react-email/components";
import { ReactElement } from "react";

const transporter = nodemailer.createTransport({
  host: process.env.MAIL_HOST,
  port: Number(process.env.MAIL_PORT),
  secure: Number(process.env.MAIL_PORT) === 465,
  auth: {
    user: process.env.MAIL_USERNAME,
    pass: process.env.MAIL_PASSWORD,
  },
});

interface SendEmailOptions {
  to?: string | string[];
  subject: string;
  template: ReactElement;
}

export async function sendEmail({ to, subject, template }: SendEmailOptions) {
  const html = await render(template);
  
  const recipients = to || process.env.MAIL_RECIPIENTS?.split(",") || [];

  const mailOptions = {
    from: process.env.MAIL_FROM,
    to: recipients,
    subject,
    html,
  };

  try {
    const info = await transporter.sendMail(mailOptions);
    console.log("Email sent: %s", info.messageId);
    return { success: true, messageId: info.messageId };
  } catch (error) {
    console.error("Error sending email:", error);
    return { success: false, error };
  }
}