Closed Mailbox with Raised Flag

Mail: something sent, something arriving, or a place to reach me. In a chat, “📫 sent your birthday card” means a real letter or parcel is on its way through the post, and “go check your 📫” means something has arrived or should have. The emoji points at paper post more than at email, but many people use it loosely for any kind of message, including email and direct messages (DMs).

In profiles and bios it works as a label rather than a message. Put in front of an email address, a contact form or the words “DMs open”, it simply says “here is how to reach me”. Newsletter writers and small shops sometimes use it the same way: “📫 subscribe” or “📫 orders ship Monday”. It is friendly and neutral, with no well-known second meaning, so it sits comfortably in a message to a boss, a customer or a grandparent.

What is the flag for, and why does it look like that?

The box is an American roadside mailbox, and the raised flag means outgoing mail. In the United States, many houses on rural and suburban roads have a tunnel-shaped metal box on a post by the street. The mail carrier drives up, drops letters inside and closes the door. If you want to send something, you put it in the box and raise the red flag; that tells the carrier to stop and collect it, and the carrier lowers the flag afterwards. So, by US custom, 📫 shows a box with a letter waiting to go out.

Many readers see the flag the other way round, as “you've got mail”, and Unicode's own notes describe 📫 that way too: a mailbox containing mail. Either way, the emoji means “mail”. Home letter boxes look different in much of the world, often a slot in the door or a plain box with no flag, while 📮 shows the public postbox, such as Britain's red pillar box, that you drop letters into. The design came into emoji through the original Japanese mobile-phone sets.