Although Feedback 4.4.1 was the last version prior to my further development of the module, I don't recall any issue with unauthenticated users submitting feedback.

What happens when an unauthenticated user clicks the Send button:

Error is displayed? (also check Event Viewer for any logged errors)
Feedback is stored in database but no email sent to specified Send To address?
Postback only without any error display and no Feedback stored to database?

Feedback 4.4.1 (and 4.4.3, the latest version compatible with your DNN install) always sent the email using the email email entered into the Feedback form as the Send From address. I suspect that the issue may be that your hosting provider's email server may block the sending of email when the Send From domain is not the same as the site's domain. Do the registered users that are able to send feedback have email addresses in the same domain as the site but the unregistered users you tested do not?

Feedback 5.00.02 was the first of the "newer" versions that included a Send From field in the module's settings to over come this issue. Feedback 5.00.02 requires a DNN installation of of 5.2.3 or later.

In addition to considering upgrading both your DNN installation and Feedback module, please check that the Host Settings -> SMTP Server settings are properly configured. If they are not configured to require at least Basic Authentication with the proper username and password then this is even more likely the cause of the problem.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

When logged in as admin or host user navigate to Admin --> Event Viewer to view more details of errors that have been logged. In many cases it is better to login as host user as you will often be able to see additional error details and some errors that are not visible to the admin user.

You must login as host user to see and change SMTP Server settings. They are found under Host --> Host Settings.

In the Feedback module settings is Moderation enabled? If so, the missing feedback from anonymous users may be getting added to the database but will not be visible in the Feedback Comments module until it has been approved. Please use the Moderate Posts command in the Feedback module's action menu to view posts not yet approved.

Feedback version 4.4.3 is the latest version that could be installed in your current DotNetNuke version.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner