Correct

邮筒

/ yóutǒng / 
Strokes

Definition

mailbox/pillar box/(old) letter

Example

As a Noun

postbox; mailbox; letterbox; pillar box

1
Bǎ
把
xìn
信
tóu
投
jìn
进
yóutǒng
邮筒

drop a letter into a mailbox