Many Yahoo emails do show you the original source, and the original is just an EML file. These were files directly exported from Epstein's Yahoo account. Bloomberg used these EMLs to confirm that the Yahoo emails are real (https://www.bloomberg.com/news/newsletters/2025-09-12/epstei...).
We don't tamper with these EMLs, so we currently don't make the EML accessible if the team had to redact any contents of that email.