What are the functions of mail user agent?

A Mail User Agent (MUA) is software that allows users to send, receive, and manage their email. Its primary functions include composing and sending messages, retrieving and displaying incoming emails, organizing email folders, and providing features like address book management and filtering. Additionally, MUAs often support various email protocols such as IMAP and SMTP to facilitate communication with mail servers. Overall, MUAs enhance user experience by providing a user-friendly interface for handling email tasks.