LimeSurvey version: Version 6.15.1
Own server or LimeSurvey Cloud: Own Server
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Could we integrate a survey response tracking mechanism, primarily to detect and flag negative responses (low ratings), and enable the automatic sending of personalized follow-up emails in such cases?

Hi,
Use ExpressionScript to calculate and detect "negative" responses (Up to you to create an algorithm "what is negative")

Use one of the "Admin notifications" to send the mail. Adapt it to your needs.

Or you may use the plugin "pdfreport" to create a good looking report you can send.

Anyway: Is it a closed survey or not? If not you have to ask for the mail address.

Joffm