The proper salutation lies just between the two extremes: the juste milieu is the proper thing always.
"Manners and Social Usages"
Mrs. John M. E. W. Sherwood
If Lady Beltham, to whom I could speak about it, would admit you into her little company, I am sure you would be in a most delightful milieu, and Lady Beltham, whom, I know, you would please, would almost certainly interest herself in your future.
"Fantômas"
Pierre Souvestre Marcel Allain
On the Zone, the Spanish labourer works in order to save and to depart, the milieu being foreign to him and unattractive.
"The Panama Canal and its Makers"
Vaughan Cornish