System property glide.ui.email_client.reply_to no longer works to deactivate the Reply to fieldDescriptionAccording to the documentation, the glide.ui.email_client.reply_to system property does not work when setting it to true. Please see below documentation of noted property. https://docs.servicenow.com/csh?topicname=c_EnableTheEmailClient.html&version=latest Release or EnvironmentConfirmed in Madrid, New YorkCauseIs glide.ui.email_client.reply_to is a deprecated property. This was replaced by the Email client Configuration in Email client module.ResolutionTo de-activate the "Reply To" please do the following: In Filter navigator search for Email client and click on Email Client configuration Open on the Default recordUntick the "Display Reply-To" check box and save the record This will then hide the "Reply To" field on the email