信封

envelope

电子邮件

e-mail

来信

incoming envelope

收邮件

envelope with arrow

发件箱

outbox tray

收件箱

inbox tray

包裹

package

有待收信件

closed mailbox with raised flag

无待收信件

closed mailbox with lowered flag

有新信件

open mailbox with raised flag

无新信件

open mailbox with lowered flag

邮筒

postbox

投票箱

ballot box with ballot