This has been a false rumor since 2014 - see this http://mobile.lemonde.fr/les-decodeurs/article/2014/04/11/la-legende-de-l-interdiction-des-mails-professionnel

This has been a false rumor since 2014 - see this http://mobile.lemonde.fr/les-decodeurs/article/2014/04/11/la-legende-de-l-interdiction-des-mails-professionnels-apres-18-heures_4399675_4355770.html http://mobile.lemonde.fr/les-decodeurs/article/2014/04/11/la... for earlier debunking