Closed Mailbox With Raised Flag on Telegram

What it signals here

sticker mapping

Maps to sticker packs themed around communication, letters, and waiting.

channel use

Channel admins use it to signal a newsletter-style update has been pushed out.

group meaning

In group chats, used to flag that an important message was sent that needs attention.

bot context

Bots may use it to confirm that a notification or email has been dispatched to a user.

See it elsewhere