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lib/mailer.ts

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+import nodemailer from "nodemailer";
+
+type MailPayload = {
+  to: string;
+  subject: string;
+  text: string;
+};
+
+const hasSmtpConfig = () =>
+  Boolean(
+    process.env.SMTP_HOST &&
+      process.env.SMTP_PORT &&
+      process.env.SMTP_USER &&
+      process.env.SMTP_PASS
+  );
+
+export async function sendMail(payload: MailPayload) {
+  if (!hasSmtpConfig()) {
+    // Fallback for dev: log instead of sending.
+    console.log("[mail]", payload.subject, payload.text);
+    return;
+  }
+
+  const transporter = nodemailer.createTransport({
+    host: process.env.SMTP_HOST,
+    port: Number(process.env.SMTP_PORT),
+    secure: process.env.SMTP_SECURE === "true",
+    auth: {
+      user: process.env.SMTP_USER,
+      pass: process.env.SMTP_PASS
+    }
+  });
+
+  await transporter.sendMail({
+    from: process.env.SMTP_FROM || process.env.SMTP_USER,
+    to: payload.to,
+    subject: payload.subject,
+    text: payload.text
+  });
+}