config/environments/production.rb

@@ -79,8 +79,7 @@ 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
     {}