Related Rule
France
Practice Relating to Rule 125. Correspondence of Persons Deprived of Their Liberty
France’s LOAC Summary Note (1992) provides: “Captured combatants have the right to exchange news.” 
France, Fiche de Synthèse sur les Règles Applicables dans les Conflits Armés, Note No. 432/DEF/EMA/OL.2/NP, Général de Corps d’Armée Voinot (pour l’Amiral Lanxade, Chef d’Etat-major des Armées), 1992, § 2.1.
France’s LOAC Teaching Note (2000) provides that every prisoner of war “is entitled to exchange news, to send letters and to receive mail”. 
France, Fiche didactique relative au droit des conflits armés, Directive of the Ministry of Defence, 4 January 2000, annexed to the Directive No. 147 of the Ministry of Defence of 4 January 2000, p. 3.
The instructions given to the French armed forces for the conduct of Opération Mistral, simulating a military operation under the right of self-defence or a mandate of the UN Security Council, state that detainees “have the right to correspond with their families”. 
France, Etat-major de la Force d’Action Rapide, Ordres pour l’Opération Mistral, 1995, Section 6, § 62.