open mailbox with raised flag (U+1F4EC)

The envelope emoji, 📬, is a stylized representation of a traditional postal envelope. It is often used in digital communication to represent the sending or receipt of mail or a message. This emoji can be used in a variety of contexts, such as to indicate that a message or email has been sent, to ask someone to check their mail, or to convey the idea of sending or receiving something via post. Additionally, it can also be used to represent the concept of snail mail, as opposed to electronic or digital communication.