Shipmail's Email Health Check tool analyzes your email domain's configuration and reputation to identify potential issues that may affect email deliverability. It helps users understand why their emails might be landing in spam or not reaching inboxes. The tool is designed for anyone sending emails, including marketers, businesses, and individuals who want to ensure their communications are received. By providing clear reports, it aims to simplify the process of diagnosing and resolving email deliverability problems. Specific limitations are not detailed in the provided description, but typically such tools may not cover all possible deliverability factors or guarantee a fix for every issue.