Does J-GLOBAL’s contact feature actually reach researchers?

Has anyone successfully contacted researchers through J-GLOBAL (jglobal.jst.go.jp)?

I'm trying to reach Japanese researchers, but most don't list public email addresses. J-GLOBAL seems to be the main option, but I'm unsure how the "contact this researcher" feature actually works. Does it forward to their institutional email, or is it an internal messaging system they might never check?

I've contacted some researchers without any responses. Before I assume the feature is ineffective, I wanted to ask: has anyone here gotten replies this way?