diff --git a/config/environments/production.rb b/config/environments/production.rb
index 5705ffcf..7348af15 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -86,6 +86,7 @@ Rails.application.configure do
     :openssl_verify_mode  => ENV['SMTP_OPENSSL_VERIFY_MODE'],
     :enable_starttls_auto => ENV['SMTP_ENABLE_STARTTLS_AUTO'] || true,
     :tls                  => ENV['SMTP_TLS'].presence,
+    :ca_file              => "/etc/ssl/certs/ca-certificates.crt"
   }
 
   config.action_mailer.delivery_method = ENV.fetch('SMTP_DELIVERY_METHOD', 'smtp').to_sym