addressee
aircraft
airplane
communicate
communication
correspondence
courier
curved
deliver
deliverer
delivery
email
flat
glyph
icons
information
isolated
letter
logotype
mail
message
messaging
newsletter
outbound
outbox
outgoing
paper
paperplane
plain
plane
post
rounded
roundedsquare
send
sendmail
service
silhouette
simple
solid
solidicon
solution
squares
success
target
transfer
transport