все письма были приняты адресатами,

все письма были приняты адресатами, это подтверждено штампами
копия письма с штампами в приложении

Results (English) 1:

all the letters were accepted by the addressees, is confirmed by the stamps a copy of the letter with the stamps in your application

Results (English) 2:

all the letters have been received by the addressee, it is confirmed stamps
copy of the letter with a stamp in the application

Results (English) 3:

All letters have been accepted destinations, this is confirmed by die-to-die
a copy of the letter from the die-to-die in the annex