recent changes to kc/mapi.so are causing the following problem:
When trying to open a html-based mail-item in webapp, an error-dlg pops-up "Could not open message" and the preview pane shows a centered "failed" text. This seems to apply for any kind of html-message.
- No useful hints in php-fpm errorlog.
- Messages are correctly shown in IMAP-connected clients.
- Rolling back to core-8.4.0~644_137 resolves the issue.
Webapp 126.96.36.1996 or 188.8.131.520