feat: add user confirmation email and admin BCC for contact form submissions

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

src/pages/api/contact.ts

@@ -194,9 +194,11 @@ async function sendContactEmail(data: ContactFormData): Promise<void> {
 
     const fromAddress = smtpFrom || smtpUser;
 
-    const info = await smtpTransporter.sendMail({
+    // 1) Admin notification email with BCC to SMTP_USER for delivery confirmation
+    const adminInfo = await smtpTransporter.sendMail({
       from: `"CompanySite Contact Form" <${fromAddress}>`,
       to: recipientEmail,
+      bcc: process.env.SMTP_USER, // BCC to admin inbox as delivery confirmation
       replyTo: data.email,
       subject: `[Contact Form] ${subjectLabels[data.subject] ?? data.subject} - ${data.name}`,
       text: [
@@ -226,7 +228,46 @@ async function sendContactEmail(data: ContactFormData): Promise<void> {
       `,
     });
 
-    return info;
+    // 2) User confirmation email — proves delivery works AND provides good UX
+    const userConfirmInfo = await smtpTransporter.sendMail({
+      from: `"CompanySite" <${fromAddress}>`,
+      to: data.email,
+      subject: 'We received your message - CompanySite',
+      text: [
+        `Hi ${data.name},`,
+        ``,
+        `Thank you for reaching out to us! We have received your message regarding "${subjectLabels[data.subject] ?? data.subject}".`,
+        ``,
+        `Our team will review your inquiry and get back to you as soon as possible, typically within 1-2 business days.`,
+        ``,
+        `For your reference, here is a summary of your submission:`,
+        `  Subject: ${subjectLabels[data.subject] ?? data.subject}`,
+        `  Date:    ${new Date().toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' })}`,
+        ``,
+        `If you have any urgent questions, feel free to reply to this email.`,
+        ``,
+        `Best regards,`,
+        `The CompanySite Team`,
+      ].join('\n'),
+      html: `
+        <div style="font-family:Arial,sans-serif;max-width:600px;margin:0 auto;padding:20px">
+          <h2 style="color:#333">Thank you for contacting us!</h2>
+          <p>Hi ${escapeHtml(data.name)},</p>
+          <p>We have received your message regarding <strong>"${escapeHtml(subjectLabels[data.subject] ?? data.subject)}"</strong>.</p>
+          <p>Our team will review your inquiry and get back to you as soon as possible, typically within <strong>1-2 business days</strong>.</p>
+          <div style="background:#f9f9f9;border-left:4px solid #007bff;padding:12px 16px;margin:20px 0">
+            <p style="margin:4px 0"><strong>Subject:</strong> ${escapeHtml(subjectLabels[data.subject] ?? data.subject)}</p>
+            <p style="margin:4px 0"><strong>Date:</strong> ${new Date().toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' })}</p>
+          </div>
+          <p>If you have any urgent questions, feel free to reply to this email.</p>
+          <p style="margin-top:24px">Best regards,<br><strong>The CompanySite Team</strong></p>
+          <hr style="border:none;border-top:1px solid #eee;margin-top:24px">
+          <p style="color:#888;font-size:12px">This is an automated confirmation. Please do not reply unless you need further assistance.</p>
+        </div>
+      `,
+    });
+
+    return { adminInfo, userConfirmInfo };
   } catch (err) {
     // If nodemailer isn't installed, treat as graceful degradation (log only)
     if (err instanceof Error && err.message.includes('Cannot find module')) {
@@ -374,14 +415,18 @@ export const POST: APIRoute = async ({ request, clientAddress }) => {
   console.log('Sending contact email to: ' + recipientEmail);
 
   sendContactEmail(formData)
-    .then((info) => {
-      console.log('Contact email delivered successfully to:', recipientEmail, {
-        messageId: info?.messageId,
+    .then((result) => {
+      console.log('Contact emails delivered successfully:', {
+        adminRecipient: recipientEmail,
+        adminMessageId: result?.adminInfo?.messageId,
+        userRecipient: formData.email,
+        userMessageId: result?.userConfirmInfo?.messageId,
       });
-      logger.info('api.contact', 'Contact email delivered successfully', {
-        recipient: recipientEmail,
-        messageId: info?.messageId,
-        from: formData.email,
+      logger.info('api.contact', 'Contact emails delivered successfully', {
+        adminRecipient: recipientEmail,
+        adminMessageId: result?.adminInfo?.messageId,
+        userRecipient: formData.email,
+        userMessageId: result?.userConfirmInfo?.messageId,
         subject: formData.subject,
       });
     })