Worked on the chatwoot/chatwoot repository to address a critical reliability issue in email rendering, specifically targeting the handling of inline images when the Content-Disposition header is missing. Utilized Ruby on Rails and RSpec to implement a solution that rewrites cid-referenced images in HTML emails using url_for, ensuring correct display across various email clients. Developed comprehensive regression tests to verify the robustness of the fix for cid-based inline attachments and maintained adherence to project style guidelines through thorough self-review. This backend development effort improved email compatibility and user trust by strengthening the reliability of email image rendering in the application.