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.
Thank you.