mail, stagecoach stop
郵 centers on a system for sending and receiving written messages: mail. The older sense of a stagecoach stop fits as a historical relay point in that delivery network.
郵 combines 垂 (likely contributing the sound) with ⻏ (village), originally referring to a relay station or post town in a communication network.
The left side 垂 looks like a hanging pouch or bundle, and the right side ⻏ is a village. Imagine a mail pouch hanging at a village relay station, ready to be carried to the next stop.
For ユウ, picture a letter addressed to you arriving at the village mail stop: you -> ユウ, and the mail is delivered.
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mail service; postal service; mail; post
mailing; posting
postal system
mailbox; letter box; letterbox; mail slot
postal (post-office) savings (deposit)
mail boat
(former) Ministry of Posts and Telecommunications (now Ministry of Internal Affairs and Communications)
Universal Postal Union
domestic mail
contents-certified mail
Express Mail Service (for international mail); EMS
international mail; overseas mail
local postal attributes
mail from abroad; foreign mail; overseas mail
foreign postal money order
non-standard-sized mail
standard-size mail
parcel (to be sent by post)
New Year's mail
email from a cell phone or mobile phone