diff --git a/config/site_settings.yml b/config/site_settings.yml
index 16d9e29cbaa..777586427ba 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -775,6 +775,7 @@ email:
   pop3_polling_port: 995
   pop3_polling_username: ''
   pop3_polling_password: ''
+  pop3_polling_delete_from_server: true
   log_mail_processing_failures: false
   incoming_email_prefer_html: true
   email_in: