Add mail config message after installation

refs TryGhost#216
- adds a little ui message to guide people towards docs for mail config

Author: cobbspur

lib/commands/start.js

@@ -60,7 +60,13 @@ class StartCommand extends Command {
 
                 return this.ui.run(processInstance.enable(), 'Enabling instance startup on server boot');
             }).then(() => {
+                let mail = instance.config.get('mail');
                 this.ui.log(`You can access your blog at ${instance.config.get('url')}`, 'cyan');
+
+                if (mail.transport && mail.transport === 'Direct') {
+                    this.ui.log(`\nGhost uses direct mail by default`, `green`);
+                    this.ui.log(`To set up an alternative email method read our docs at https://docs.ghost.org/docs/mail-config`, `green`);
+                }
             });
         });
     }