More SMTP customization (#1372)

* Allow SMTP auth method customization

* Add SMTP openssl_verify_mode option support

Allows one use self-signed certs with their SMTP server.

* Add SMTP enable_starttls_auto option support

config/environments/production.rb

@@ -99,7 +99,9 @@ Rails.application.configure do
     :user_name      => ENV['SMTP_LOGIN'],
     :password       => ENV['SMTP_PASSWORD'],
     :domain         => ENV['SMTP_DOMAIN'] || config.x.local_domain,
-    :authentication => :plain,
+    :authentication => ENV['SMTP_AUTH_METHOD'] || :plain,
+    :openssl_verify_mode => ENV['SMTP_OPENSSL_VERIFY_MODE'] || 'peer',
+    :enable_starttls_auto => ENV['SMTP_ENABLE_STARTTLS_AUTO'] || true,
   }
 
   config.action_mailer.delivery_method = :smtp