Here are the steps to enable auto-acknowledgement for inquiries?

1. Open the account and click on the version for which you want to enable auto-acknowledgement.
2. Scroll down and click on 'Configure' for the Email card.
3. Select the tab 'Feedback', 'Ticket', or 'Feature Request' depending on which inquiry you want to configure for. You can configure for more than one type or all of them too.
4. Open the 'Email Settings' accordion and select the checkbox in front of 'Send auto reply email when user submits feedback'.
5. Open the 'Connection Details' accordion and fill in the details as per your email server.
6. You can leave the remaining setting in all the accordions to the default or go and change then as per your requirement.
7. Click 'Save' to save the settings.

For more details refer to the article Integrate with email server

For more details refer to the articles:

Manage Accounts

Configure Feedback Agent Settings

Integrate Feedback Agent with Browser Web apps

Integrate Feedback Agent with iOS mobile apps

Integrate Feedback Agent with Android mobile apps

For more details refer to the article Filtering Inquiries