I’d like to report a false positive on Claws Mail 3.9.0 for Windows. Upon installation of this new version, Avast Free launched it inside its sandbox.
Please note that I attempted to report this via the Avast Contact Us page and the web page reported a 413 error upon submission (Request Entity Too Large), which is an NGINX or Windows IIS server configuration error - the particular server hosting it, is broken.
This is the Windows version of Claws Mail 3.9.0 (full version number: 3.9.0cvs12-pkg23), it was installed on Windows Vista (32-bit). The previous version that ran fine where Avast didn’t detect anything wrong, was 3.8.1 (full version number: 3.8.1cvs11-pkg14).
Claws was also installed on Windows 7 (64-bit), but Avast did not detect anything wrong with Claws on this OS.