Which protocol allows a client to access and manipulate electronic mail messages on a server?

• A. Post Office Protocol (POP)
• B. Internet Message Access Protocol (IMAP)
• C. Simple Mail Transfer Protocol (SMTP)
• D. File Transfer Protocol (FTP)

Answer: (B)

Accessing and manipulating mail messages stored on a server requires a protocol that keeps messages on the server and supports actions like listing folders, reading, deleting, flagging, and moving messages. IMAP does exactly that: it maintains the mailbox on the server, allows you to organize messages into folders, search, and apply changes that stay in sync across multiple devices. You can read messages without downloading, while still leaving copies on the server, and any actions you take are reflected when you access the same account from another client. POP, by contrast, typically downloads messages and may remove them from the server, making server-side manipulation harder and less consistent across devices. SMTP is for sending mail between servers and to clients, not managing existing mail on the server. FTP is for file transfer, not email handling.