feat: mock-email and some fixes for email auth

lib/email.js

@@ -3,7 +3,7 @@ const ph = require('./plugin-helper')
 function sendMessage (settings, rec) {
   return Promise.resolve()
     .then(() => {
-      const pluginCode = 'mailgun'
+      const pluginCode = settings.config.notifications_thirdParty_email
       const plugin = ph.load(ph.EMAIL, pluginCode)
       const account = settings.accounts[pluginCode]
 
@@ -11,4 +11,15 @@ function sendMessage (settings, rec) {
     })
 }
 
-module.exports = {sendMessage}
+function sendCustomerMessage (settings, rec) {
+  return Promise.resolve()
+    .then(() => {
+      const pluginCode = settings.config.notifications_thirdParty_email
+      const plugin = ph.load(ph.EMAIL, pluginCode)
+      const account = settings.accounts[pluginCode]
+
+      return plugin.sendMessage(account, rec)
+    })
+}
+
+module.exports = {sendMessage, sendCustomerMessage}