improve logging

server/api/mail.js

@@ -19,7 +19,7 @@ const mail = {
   },
 
   _send (addresses, template, locals, locale) {
-    log.debug(`Send ${template} email to ${addresses} with locale ${locale}`)
+    log.info(`Send ${template} email to ${addresses} with locale ${locale}`)
     const email = new Email({
       views: { root: path.join(__dirname, '..', 'emails') },
       htmlToText: true,
@@ -61,8 +61,7 @@ const mail = {
     }
     return email.send(msg)
       .catch(e => {
-        log.error('Error sending email =>')
-        log.error(e)
+        log.error('Error sending email => %s', e)
       })
   }
 }