Answer:

mailer

Answer	Crossword Clue
MAILER	Sender
MAILER	"The Armies of the Night" author
MAILER	Post office user

MAILER	Large envelope
MAILER	"The Executioner's Song" novelist
MAILER	Jiffy Bag, e.g.
MAILER	"The Executioner's Song" Pulitzer winner
MAILER	"Marilyn: A Biography" author
MAILER	Padded envelope
MAILER	"The Executioner's Song" author
MAILER	"The Executioner's Song" author Norman

MAILER	Postal package
MAILER	Shipping supply
MAILER	Ad campaign item
MAILER	Post office patron
MAILER	Writer Norman
MAILER	Advertising leaflet
MAILER	"Armies of the Night" author
MAILER	One sending a letter

MAILER	Tube for shipping
MAILER	Capote contemporary
MAILER	Novelist Norman
MAILER	Young Brooklyn best-selling author.
MAILER	He wrote "The Naked and the Dead"
MAILER	Post boat.
MAILER	Author of a best-selling war novel.
MAILER	He wrote "Barbary Shore."

MAILER	Novelist Norman.
MAILER	He wrote "The Deer Park."
MAILER	Office machine.
MAILER	American writer.
MAILER	American author.
MAILER	Postal machine
MAILER	U.S. author
MAILER	"Deer Park" author

MAILER	U.S. writer
MAILER	U.S. novelist
MAILER	Author of "The Naked and the Dead"
MAILER	He wrote "The Fight"
MAILER	He wrote "The Prisoner of Sex"