Assign Category for SRs coming from Email Channel

Summary: When inquries are sent to mailbox, an SR is created without a Category value. What can be done to auto-populate the Category with a specific value depending on the mailbox the inquiry was sent to.

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Version (include the version you are using, if applicable):

24C (11.13.24.07.0)

Code Snippet (add any code snippets that support your topic, if applicable):

I try this in Create and Before insert trigger, no luck