A curbside mailbox (letterbox, postbox) with its door latched shut and signal flag raised. Generally depicted in blue or gray with a red flag. Used for various content concerning postal deliveries and email.
Indicates in the United States that incoming mail (post) has been delivered. May also indicate that there is outgoing mail for pickup.
Compare 📪 Closed Mailbox With Lowered Flag, 📭 Open Mailbox With Lowered Flag, and 📬 Open Mailbox With Raised Flag.
Closed Mailbox with Raised Flag was approved as part of Unicode 6.0 in 2010 and added to Emoji 1.0 in 2015.