La Poste

Small post office on Île-​de-​France near Notre Dame Cathedral, so if you’re looking to get your postcards mailed. The clerk was very helpful and told me the right amount of postage to buy (87 cents for an international stamp) in clear English. Two machines in the office accepted coins and notes. There are also cash points («ATMs» in American) outside.
It looks like they offer a number of other services here, including packages and letters plus the other things that post offices do.