diff --git a/admin_manual/configuration_server/config_sample_php_parameters.rst b/admin_manual/configuration_server/config_sample_php_parameters.rst
index 4680b1ecc..6874f843c 100644
--- a/admin_manual/configuration_server/config_sample_php_parameters.rst
+++ b/admin_manual/configuration_server/config_sample_php_parameters.rst
@@ -979,7 +979,9 @@ mail_domain
 
 The return address that you want to appear on emails sent by the Nextcloud
 server, for example ``nc-admin@example.com``, substituting your own domain,
-of course.
+of course. Please note that this is *not* the domain used for the SMTP protocol handhshake.
+So if you want to have the server responding with an EHLO reply identifiying itself properly,
+please configure ``overwrite.cli.url`` accordingly.
 
 mail_from_address
 ^^^^^^^^^^^^^^^^^