feat: replace Resend SDK with Mailcow SMTP (nodemailer)

Swap email sending from Resend API to self-hosted Mailcow at
mx.jeffemmett.com. Uses SMTP_PASS env var instead of RESEND_API_KEY.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api/application.js

@@ -1,8 +1,8 @@
 // Application form API endpoint
-// Handles full event applications with PostgreSQL storage and Resend emails
+// Handles full event applications with PostgreSQL storage and Mailcow SMTP emails
 
 const { Pool } = require('pg');
-const { Resend } = require('resend');
+const nodemailer = require('nodemailer');
 
 // Initialize PostgreSQL connection pool
 const pool = new Pool({
@@ -10,8 +10,16 @@ const pool = new Pool({
   ssl: process.env.NODE_ENV === 'production' ? { rejectUnauthorized: false } : false
 });
 
-// Initialize Resend
+// Initialize SMTP transport (Mailcow)
-const resend = new Resend(process.env.RESEND_API_KEY);
+const smtp = nodemailer.createTransport({
+  host: process.env.SMTP_HOST || 'mx.jeffemmett.com',
+  port: parseInt(process.env.SMTP_PORT || '587'),
+  secure: false,
+  auth: {
+    user: process.env.SMTP_USER || 'noreply@jeffemmett.com',
+    pass: process.env.SMTP_PASS || '',
+  },
+});
 
 // Email templates
 const confirmationEmail = (application) => ({
@@ -238,17 +246,17 @@ module.exports = async function handler(req, res) {
       };
 
       // Send confirmation email to applicant
-      if (process.env.RESEND_API_KEY) {
+      if (process.env.SMTP_PASS) {
         try {
           const confirmEmail = confirmationEmail(application);
-          const { data: emailData } = await resend.emails.send({
+          const info = await smtp.sendMail({
             from: process.env.EMAIL_FROM || 'Valley of the Commons <noreply@jeffemmett.com>',
             to: application.email,
             subject: confirmEmail.subject,
-            html: confirmEmail.html
+            html: confirmEmail.html,
           });
           await logEmail(application.email, `${application.first_name} ${application.last_name}`,
-            'application_confirmation', confirmEmail.subject, emailData?.id, { applicationId: application.id });
+            'application_confirmation', confirmEmail.subject, info.messageId, { applicationId: application.id });
         } catch (emailError) {
           console.error('Failed to send confirmation email:', emailError);
         }
@@ -257,14 +265,14 @@ module.exports = async function handler(req, res) {
         try {
           const adminEmail = adminNotificationEmail(application);
           const adminRecipients = (process.env.ADMIN_EMAILS || 'jeff@jeffemmett.com').split(',');
-          const { data: emailData } = await resend.emails.send({
+          const info = await smtp.sendMail({
             from: process.env.EMAIL_FROM || 'Valley of the Commons <noreply@jeffemmett.com>',
-            to: adminRecipients,
+            to: adminRecipients.join(', '),
             subject: adminEmail.subject,
-            html: adminEmail.html
+            html: adminEmail.html,
           });
           await logEmail(adminRecipients[0], 'Admin', 'admin_notification',
-            adminEmail.subject, emailData?.id, { applicationId: application.id });
+            adminEmail.subject, info.messageId, { applicationId: application.id });
         } catch (emailError) {
           console.error('Failed to send admin notification:', emailError);
         }

api/waitlist-db.js

@@ -1,8 +1,8 @@
 // Waitlist API endpoint using PostgreSQL
-// Simple interest signups with email confirmation via Resend
+// Simple interest signups with email confirmation via Mailcow SMTP
 
 const { Pool } = require('pg');
-const { Resend } = require('resend');
+const nodemailer = require('nodemailer');
 
 // Initialize PostgreSQL connection pool
 const pool = new Pool({
@@ -10,8 +10,16 @@ const pool = new Pool({
   ssl: process.env.NODE_ENV === 'production' ? { rejectUnauthorized: false } : false
 });
 
-// Initialize Resend
+// Initialize SMTP transport (Mailcow)
-const resend = new Resend(process.env.RESEND_API_KEY);
+const smtp = nodemailer.createTransport({
+  host: process.env.SMTP_HOST || 'mx.jeffemmett.com',
+  port: parseInt(process.env.SMTP_PORT || '587'),
+  secure: false,
+  auth: {
+    user: process.env.SMTP_USER || 'noreply@jeffemmett.com',
+    pass: process.env.SMTP_PASS || '',
+  },
+});
 
 const welcomeEmail = (signup) => ({
   subject: 'Welcome to Valley of the Commons',
@@ -137,16 +145,16 @@ module.exports = async function handler(req, res) {
     };
 
     // Send welcome email
-    if (process.env.RESEND_API_KEY) {
+    if (process.env.SMTP_PASS) {
       try {
         const email = welcomeEmail(signup);
-        const { data: emailData } = await resend.emails.send({
+        const info = await smtp.sendMail({
           from: process.env.EMAIL_FROM || 'Valley of the Commons <noreply@jeffemmett.com>',
           to: signup.email,
           subject: email.subject,
-          html: email.html
+          html: email.html,
         });
-        await logEmail(signup.email, signup.name, 'waitlist_welcome', email.subject, emailData?.id);
+        await logEmail(signup.email, signup.name, 'waitlist_welcome', email.subject, info.messageId);
       } catch (emailError) {
         console.error('Failed to send welcome email:', emailError);
         // Don't fail the request if email fails

package.json

@@ -12,8 +12,8 @@
     "@octokit/rest": "^22.0.1",
     "ai": "^6.0.1",
     "googleapis": "^126.0.1",
-    "pg": "^8.13.0",
+    "nodemailer": "^6.9.0",
-    "resend": "^4.0.0"
+    "pg": "^8.13.0"
   },
   "devDependencies": {
     "dotenv": "^16.3.1"