Implements an Internet Message Access Protocol version 4.1 client.
TIdIMAP4 = class(TIdMessageClient);
TIdIMAP4 is a TIdMessageClient descendant that implements a client for the IMAP4 (Internet Message Access Protocol version 4.1) protocol, as described in the Internet standards document:
The Internet Message Access Protocol, Version 4.1 (IMAP4rev1) allows a client to access and manipulate electronic mail messages on an IMAP4 server. IMAP4 permits manipulation of remote message folders, called "mailboxes", in a way that is functionally equivalent to local mailboxes.
IMAP4rev1 includes operations for creating, deleting, and renaming mailboxes; checking for new messages; permanently removing messages; setting and clearing flags; RFC 822 and MIME message parsing; searching; and selective fetching of message attributes, texts, and portions thereof. Messages in IMAP4rev1 are accessed by the use of numbers. These numbers are either message sequence numbers or unique identifiers.
IMAP4rev1 does not specify a means of posting mail; message posting is handled by a mail transfer protocol such as TIdSMTP.
The IMAP4 protocol allows the client to issue multiple commands before expecting a server response. In addition, server responses may not necessarily be received in the order in which the IMAP commands are issued on the client. Finally, IMAP4 responses differ from TCP-related response codes in both format and content. To accomodate these protocol differences, methods inherited from TIdTCPConnection are reimplemented to support the specifics or the IMAP protocol for sending commands and receiving responses.
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