---
sourceDocument: Australia ServiceNow AI Platform Administration
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/platform-administration

 Release :

    - australia

ft:locale :

    - en-US

ft:publication_title :

    - Australia ServiceNow AI Platform Administration

ft:clusterId :

    - platadm

bundleId :

    - platadm

workflow :

    - Platform


---

# Create a watermark prefix

# Create a custom watermark prefix for email notifications {#ariaid-title1}

Release version: Australia  
Updated March 12, 2026  
![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read  
By default, email notifications use the watermark prefix MSG,
but you can create a custom watermark prefix.

## Before you begin

Role required: admin

## About this task

Any 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

1. Navigate to AllSystem DefinitionNumber Maintenance.
2. Open the MSG record in the Email Watermark \[sys_watermark\] table.
3. Enter the unique Prefix for this instance.
4. Click Update.

## Result

Your custom watermark applies to all new email notifications. Email notifications that existed before you created a custom watermark keep the same watermarks as before.

*[\>]: and then