feat: mock-email and some fixes for email auth

lib/plugins/email/mailgun/mailgun.js

@@ -16,7 +16,22 @@ function sendMessage ({apiKey, domain, fromEmail, toEmail}, rec) {
   return mailgun.messages().send(emailData)
 }
 
+function sendCustomerMessage ({apiKey, domain, fromEmail}, rec) {
+  const mailgun = Mailgun({apiKey, domain})
+  const to = req.email.toEmail
+
+  const emailData = {
+    from: fromEmail,
+    to,
+    subject: rec.email.subject,
+    text: rec.email.body
+  }
+
+  return mailgun.messages().send(emailData)
+}
+
 module.exports = {
   NAME,
-  sendMessage
+  sendMessage,
+  sendCustomerMessage
 }