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AFTAB ALI 6AFTAB ALI 6 

what iscase auto responce rule?

VinayVinay (Salesforce Developers) 
Auto-response rules let you automatically send email responses to lead or case submissions based on the record’s attributes. For example, you can send an automatic reply to customers to let them know someone at your company received their inquiry.

Create auto-response rules for leads captured through a Web-to-Lead form and for cases submitted through.
  • Self-Service portal
  • Customer Portal
  • Web-to-Case form
  • Email-to-Case message
  • On-Demand Email-to-Case message
https://help.salesforce.com/s/articleView?id=sf.creating_auto-response_rules.htm&type=5

Please mark as Best Answer if above information was helpful.

Thanks,