Create a custom watermark prefix for email notifications By default, email notifications use the watermark prefix MSG, but you can create a custom watermark prefix. Before you beginRole required: admin About this task Any email notifications that are forwarded from one instance to another might be indistinguishable because they use the same watermark. To avoid unintentionally triggering events in the wrong instance, create a unique watermark prefix for each instance. Procedure Navigate to System Definition > Number Maintenance. Open the sys_watermark record. Make the Prefix unique for this instance. Click Update.