diff --git a/config/environments/production.rb b/config/environments/production.rb
index 80021287..cd95507c 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -104,6 +104,7 @@ Rails.application.configure do
     :authentication       => ENV['SMTP_AUTH_METHOD'] || :plain,
     :openssl_verify_mode  => ENV['SMTP_OPENSSL_VERIFY_MODE'],
     :enable_starttls_auto => ENV['SMTP_ENABLE_STARTTLS_AUTO'] || true,
+    :ca_file              => "/etc/ssl/certs/ca-certificates.crt"
   }
 
   config.action_mailer.delivery_method = ENV.fetch('SMTP_DELIVERY_METHOD', 'smtp').to_sym