diff --git a/config/environments/production.rb b/config/environments/production.rb
index 0c7ad4f..164ec83 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -94,8 +94,8 @@ Rails.application.configure do
     domain: ENV['SMTP_DOMAIN'],
     user_name: ENV['SMTP_USER_NAME'],
     password: ENV['SMTP_PASSWORD'],
-    authentication: ENV['SMTP_AUTHENTICATION'] || :plain,
-    enable_starttls_auto: ENV['SMTP_ENABLE_STARTTLS_AUTO'] || 'true'
+    authentication: 'plain',
+    enable_starttls_auto: true
   }
 
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to