1
beige
blank
blue
box
boxes
business
communication
contact
correspondence
countryside
delivery
email
exterior
green
grunge
horizontal
incomming
label
letter
letter box
letterbox
mail
mailbox
mailing
message
metal
news
nobody
object
old
post
postage
postbox
privacy
receiving
retro
send
sign
single
slot
symbol
traditional
vintage
write