diff --git a/config/environments/production.rb b/config/environments/production.rb
index c94e5df..b026af1 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -79,7 +79,8 @@ Rails.application.configure do
       port: File.read("/run/secrets/smtp_port").strip.to_i,
       user_name: File.read("/run/secrets/smtp_user_name").strip,
       password: File.read("/run/secrets/smtp_password").strip,
-      authentication: File.read("/run/secrets/smtp_authentication").strip.to_sym
+      authentication: File.read("/run/secrets/smtp_authentication").strip.to_sym,
+      tls: true
     }
   rescue Errno::ENOENT
     {}