How does ServiceNow match inbound email to existing records?

The correct answer is A. Watermark. ServiceNow uses a Watermark - a unique hidden identifier embedded in the email body - to match inbound email replies to existing records (such as Incidents or Cases). When ServiceNow sends an outbound notification, it embeds this watermark. When a reply arrives, the inbound…

Submitted by rachelw· Apr 18, 2026Application Automation

Question

Options

AWatermark
BRecord link
CSubject line
Dsys_id

How the community answered

(23 responses)

A
91% (21)
C
4% (1)
D
4% (1)

Explanation

ServiceNow uses a Watermark - a unique hidden identifier embedded in the email body - to match inbound email replies to existing records (such as Incidents or Cases). When ServiceNow sends an outbound notification, it embeds this watermark. When a reply arrives, the inbound email processing reads the watermark to identify which record the email relates to and appends it accordingly. A record link (B) is a URL but not used for automated matching. Subject line (C) alone is unreliable. sys_id (D) is the internal record identifier but is not the primary matching mechanism for email.

Topics

#Email Processing#Watermark#Inbound Email

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