Use Pimple instead of Core\Registry and add Monolog for logging

app/ServiceProvider/Mailer.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace ServiceProvider;
+
+use Pimple\Container;
+use Pimple\ServiceProviderInterface;
+use Swift_SmtpTransport;
+use Swift_SendmailTransport;
+use Swift_MailTransport;
+
+class Mailer implements ServiceProviderInterface
+{
+    public function register(Container $container)
+    {
+        $container['mailer'] = $this->getInstance();
+    }
+
+    public function getInstance()
+    {
+        switch (MAIL_TRANSPORT) {
+            case 'smtp':
+                $transport = Swift_SmtpTransport::newInstance(MAIL_SMTP_HOSTNAME, MAIL_SMTP_PORT);
+                $transport->setUsername(MAIL_SMTP_USERNAME);
+                $transport->setPassword(MAIL_SMTP_PASSWORD);
+                $transport->setEncryption(MAIL_SMTP_ENCRYPTION);
+                break;
+            case 'sendmail':
+                $transport = Swift_SendmailTransport::newInstance(MAIL_SENDMAIL_COMMAND);
+                break;
+            default:
+                $transport = Swift_MailTransport::newInstance();
+        }
+
+        return $transport;
+    }
+}