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 taskAny email notifications that are forwarded from one instance to another might be more easily distinguished with different prefixes for each instance. To avoid unintentionally triggering events in the wrong instance, create a unique watermark prefix for each instance.Note: Do not use colons (:) in custom watermark prefixes. Colons are a reserved character and may cause the watermark to be ignored. Procedure Navigate to System Definition > Number Maintenance. Open the MSG record in the Email Watermark [sys_watermark] table. Enter the unique Prefix for this instance. Click Update.