Which of the following is NOT a feature of IMAP4?

IMAP4, or Internet Message Access Protocol version 4, is designed to allow users to access and manage emails directly on the mail server. One of its key features is that emails remain stored on the server, allowing users to manage their messages without needing to download them.

The correct answer indicates that IMAP4 does not store attachments only on the client side. Instead, when an email with attachments is accessed, the attachments can remain stored on the server and can be downloaded when needed. This allows users the flexibility to access their emails and attachments from multiple devices without losing the central repository of their data.

Additionally, IMAP4 supports multiple email accounts, which means users can manage several accounts from one email client. Another feature of IMAP4 is the capability to make emails available offline; however, this often involves syncing the messages to the client so they can be accessed when not connected to the internet. Overall, the central characteristic of IMAP4 is its focus on server-side management rather than client-side storage, making option D the one that does not fit with its functionality.