France is a country where the sense of hierarchy is very important. every decision is taken at a specific hierarchical level must be validated by the higher levels and applied without question by the lower levels. it is very important to understand that in such a hierarchical organization, the final decision rests with the person who is the highest ranking. The French hierarchy manifests itself in the process of decision making but also in the life of the company. so it is very difficult to contact a manager who is more than two levels of hierarchy above without going through intermediate levels. thus at an important meeting, the floor is assigned in the hierarchical sense. so when you send an email to the recipients must be in hierarchical order, starting with the highest person.
Such an organization enables individuals to know where he stands, what he has to do, to whom he is accountable but it is not without flaws. information are much more time to run and urgent decisions are taken at the last moment. more if the decision of the CEO or someone highly placed is not good, it will be applied.