My experience with Autumn Damask is that while the blossoms are treasures, the plant itself is gangly and the leaves very coarse (and it ran like a rabbit here...). Because of that, I think it may not harmonize well with Mme. Lombard (which I have grown) or Crocus Rose (have not grown), even if the blossom colors agree. I am not familiar with Leda, unfortunately.

How about a damask perpetual like Jacques Cartier? He is very tidy here, nice leaves and shrub and good rebloom.

Your zone is different than mine, but my Crocus Rose would cover my mailbox. It is very nice and shrubby so it would make up for neked legs on roses.

Autumn Damask is a handsome rose, but it is best placed deep in the background. Not only is the foliage coarse as Catspa mentioned, but also it is very thorny. Your mail carrier and any passersby will not thank you for planting it where they might come in contact with it.

You do not want to inflict injuries on the person who brings you mail and packages. You want this person to be your friend. Beautiful flowers and fragrance, yes; thorns, not such a good idea.

You could place the roses at the further end of your mailbox bed with some non-thorny plants closer to the mailbox. Perhaps some plants that bloom when roses are dormant in the summer heat would be an advantage. August tends to be a difficult time for many roses, so August blooming perennials or even annual fillers would be my suggestion -- asters, dahlias, caryopteris, late lilies, phlox. Just look up what blooms at that time in your area.

Rosefolly