A content or document management system includes a content or document repository; a dedicated e-mail account; and a mail agent associated with the dedicated e-mail account. The mail agent processes a received e-mail message to determine a sender's identity; authenticates the identity of the sender and an authorization of the sender with respect to the content or document repository; parses, when a sender is authenticated and authorized, document request information from the e-mail message; and either stores a document to or retrieves a document from the content or document repository. The mail agent may authenticate the identity of the sender using a digital signature, or may authenticate the identity of the sender using an e-mail address in a FROM header field of the received e-mail message header. The mail agent may decrypt encrypted messages from the sender, and may sign and encrypt responses to the sender.