The Mailman Brown Drake Fly Pattern is really a great pattern, it can be either a brown drake soft hackle style emerger or drowned adult fly pattern.
This Fly Tying Tutorial is by Flyfishfood.com and Curtis Fry
This Mailman Brown Drake is the pattern you would want to use when you see the Brown Drakes hatching.
This is not a hard fly to tie and may just be that special Trout Catching Fly of all times in your fly box.
Go ahead and give this Mailman Brown Drake pattern a try, it is pretty basic slender fly that works so well as a imitation to the Brown Drake Hatch.