Must bar le duc mail

I think you meant to ask "Must Bar Le Duc mail?"

Bar Le Duc is a French wine region, and "mail" is a French word for "send" or "post". So, I'm assuming you're asking if wine from Bar Le Duc must be sent or posted.

The answer is no, wine from Bar Le Duc does not necessarily need to be sent or posted. Bar Le Duc is a wine region in the Languedoc-Roussillon region of France, and wine from this region can be consumed locally or exported to other countries.

However, if you're asking if wine from Bar Le Duc must be labeled or certified with a specific appellation or designation, the answer is yes. Wine from Bar Le Duc must meet certain standards and regulations to be labeled as "Bar Le Duc" or "Vin de Pays d'Oc", which is a protected designation of origin in the European Union.

I hope that helps clarify things!