address
airmail
bank
business
cargo
closeup
communicate
communication
confidential
correspondence
data
delivery
department
desktop
detail
distribution
document
empty
envelope
file
filled
folder
hand
information
letter
mail
message
notice
object
office
out
package
packet
paper
partners
pen
postage
postal
record
rectangle
recycled
secret
secure
send
sending
service
sheet
stationery
white
yellow