Add more generic SMTP options

lib/email/index.ts

@@ -1,13 +1,24 @@
-import { Resend } from "resend";
+import nodemailer from "nodemailer";
 import { render } from "@react-email/render";
 import { InvitationEmail } from "./templates/invitation";
 
-function getResend(): Resend {
-  const key = process.env.RESEND_API_KEY;
-  if (!key) throw new Error("RESEND_API_KEY is not configured");
-  return new Resend(key);
+function createTransport() {
+  const host = process.env.SMTP_HOST;
+  if (!host) throw new Error("SMTP_HOST is not configured");
+
+  return nodemailer.createTransport({
+    host,
+    port: parseInt(process.env.SMTP_PORT ?? "587"),
+    secure: process.env.SMTP_SECURE === "true",
+    auth:
+      process.env.SMTP_USER && process.env.SMTP_PASS
+        ? { user: process.env.SMTP_USER, pass: process.env.SMTP_PASS }
+        : undefined,
+  });
 }
 
+const FROM = () => process.env.EMAIL_FROM ?? "CubeAdmin <noreply@example.com>";
+
 export async function sendMagicLinkEmail({
   email,
   url,
@@ -17,14 +28,13 @@ export async function sendMagicLinkEmail({
   url: string;
   token: string;
 }): Promise<void> {
-  const { error } = await getResend().emails.send({
-    from: process.env.EMAIL_FROM ?? "CubeAdmin <noreply@example.com>",
+  await createTransport().sendMail({
+    from: FROM(),
     to: email,
     subject: "Your CubeAdmin sign-in link",
     html: `<p>Click the link below to sign in to CubeAdmin. This link expires in 1 hour.</p><p><a href="${url}">${url}</a></p>`,
+    text: `Sign in to CubeAdmin: ${url}\n\nThis link expires in 1 hour.`,
   });
-
-  if (error) throw new Error(`Failed to send magic link email: ${error.message}`);
 }
 
 export async function sendInvitationEmail({
@@ -38,16 +48,12 @@ export async function sendInvitationEmail({
   inviteUrl: string;
   role: string;
 }): Promise<void> {
-  const html = await render(
-    InvitationEmail({ invitedByName, inviteUrl, role }),
-  );
-
-  const { error } = await getResend().emails.send({
-    from: process.env.EMAIL_FROM ?? "CubeAdmin <noreply@example.com>",
+  const html = await render(InvitationEmail({ invitedByName, inviteUrl, role }));
+  await createTransport().sendMail({
+    from: FROM(),
     to,
     subject: `You've been invited to CubeAdmin`,
     html,
+    text: `${invitedByName} invited you to CubeAdmin as ${role}.\n\nAccept your invitation: ${inviteUrl}\n\nThis link expires in 48 hours.`,
   });
-
-  if (error) throw new Error(`Failed to send email: ${error.message}`);
 }