apartment
background
box
building
business
cabinet
communication
condo
condominium
deliver
delivery
domestic
door
enter
entrance
envelope
gray
group
hole
house
interior
letter
letterbox
life
lock
locker
lot
mail
mailbox
many
message
metal
modern
multi
multiple
multistorey
new
number
office
post
postage
postal
receive
row
security
send
service
shipping
sign
wall