outbox tray

U+1F4E4

inbox tray

U+1F4E5

european post office

U+1F3E4

japanese post office

U+1F3E3

postal horn

U+1F4EF

package

U+1F4E6

postbox

U+1F4EE

open mailbox with lowered flag

U+1F4ED

incoming envelope

U+1F4E8

envelope with downwards arrow above

U+1F4E9

e-mail symbol

U+1F4E7

envelope

U+2709

love letter

U+1F48C

fullwidth commercial at

U+FF20

commercial at

U+0040

small commercial at

U+FE6B

em quad

U+2001