Départ en retraite (à l'employé)

Dear [Mr or Mrs or Sirs], I wanted to send you, on behalf of everyone here, our best wishes for your retirement. We shall always remember your personal and professional qualities. Among other circumstances, I recall the [incident]; you proved then how competent and reliable you were. All your friends at [société] will miss you and wish you and your wife a long and very happy retirement in [lieu]. Please, do call on us when you come around. Yours sincerely [votre nom] [votre fonction]