Email sent via email client cannot be hidden on activity logIssue Emails sent via Email client from the ServiceNow are shown up in the activity log as an additional comment.Resolution Emails sent via email client show up on the activity log. This is expected and platform behavior.If a user doesn't want to show emails on activity log, From filter activity(funnel icon) disable the 'Sent/Received Emails', this will also hide other emails from the activity logIt is not possible to restrict the email client emails to hide on the activity log