👉 Unmailableness is a concept in computer science that refers to the difficulty of creating or maintaining an email account, especially one with limited features and security. It can refer to both personal and professional email accounts. The term was coined by Scott Meyers in his book "The Art of Computer Programming" (1963), which describes the difficulties encountered when trying to create a simple email account that is only capable of sending and receiving messages, without any advanced features or security measures.
