Hello @williamsun, This issue has been fixed in Kingston patch 4 but we also found a workaround solution for this problem
Workaround: 1. On the sys_properties table, set the value of glide.email.email_with_no_target_visible_to_all to true.
2. Update the sys_email table ACLs to check the headers for "X-ServiceNow-Source:EmailClient" and state of 'send-ignored', and allow visibility for appropriate roles (e.g. itil)
This workaround helped me to fix the issue and also am upgrading to Kingston patch 4 🙂
