In manual emails, images referenced through attachment thumbnails are broken (since v8.0.6) and lead to dead links (already present in v8.0.5). See attachments.
inline thumbnail images are displayed in the mail body
when clicking on them, the full-size image is opened in a new browser tab
Steps to reproduce:
1.) Create a template in JETI, render the issue description into the mail body using #renderDescription($!issue)
2.) Create an issue in Jira, add an image into the description
3.) Send out a manual email using the template created in step1.