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Autorespond with a thank you note to Leads that are generated through Webform (websites).

1. Click the User Menu on the top right of the screen 
2. Click Settings > Automation > Workflows > Add Workflow
3. Select Lead from Target Module
4. Click Lead Creation radio button in Trigger workflow on
5. Add Condition Source is Website
6. Click Send Mail from Workflow Action
7. Create Email Template, enter details
8. Click Save

Refer: Send Mail