Why this matters
Broken links are a quality signal and a practical user-experience problem. They can also hide redirect or tracking problems that only appear after send time.
A broken unsubscribe, terms, or company link is more serious than a minor secondary resource.
How to fix it
Open every customer-facing link in the final rendered email. Remove placeholders and make sure redirects resolve quickly to HTTPS pages.
Send the corrected email through the same platform and compare the new report with the original.