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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-42833109-F8C2-57FC-9995-0461698A19FF" xml:lang="en"><title>IMAP4

    13 Concepts</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    14 <p>This section describes the Internet Message Access Protocol (IMAP4) and

    15 its implementation on the Symbian platform. </p>

    16 <section id="GUID-DBF1C87D-7360-54B7-8658-B6659BF77F06-GENID-1-8-1-16-1-1-6-1-5-1-4-1-2-2"><title>IMAP4 protocol</title> <p>IMAP4

    17 is one of the most common Internet standard protocols for retrieving emails.

    18 It is an application layer Internet protocol operating on port 143 that allows

    19 a local client to access email on a remote server. </p> <p>The current version,

    20 IMAP version 4 revision 1 (IMAP4rev1), is defined by RFC 3501. Eariler, IMAP4

    21 was called Internet Mail Access Protocol, Interactive Mail Access Protocol

    22 (RFC 1064), and Interim Mail Access Protocol. </p> <p>The default port for

    23 IMAP4 to download messages is 143, but if a client establishes a secure connection

    24 (over SSL or TLS) for IMAP4 to download message, the port is 993. </p> <p>Most

    25 email clients support either POP3 or IMAP to retrieve messages; however, few

    26 Internet Service Providers (ISPs) support IMAP. IMAP4 supports access to the

    27 mail store in both modes of operation—connected (online) and disconnected

    28 (offline). </p> <p>Emails are generally sent to an email server that stores

    29 received messages in the recipient's email mailbox. The user later retrieves

    30 these messages with either a web browser or an email client that uses one

    31 of a number of email retrieval protocols. </p> <p>Email clients using IMAP4

    32 generally stores messages on the server until the user explicitly deletes

    33 them. This allows multiple clients to access the same mailbox. However, the

    34 client may store local copies of the messages, but these are considered to

    35 be a temporary cache; the server's store is authoritative. </p> </section>

    36 <section id="GUID-6162DB96-ED81-4AA4-B737-8298DC0A94D1"><title>Symbian platform implementation of IMAP4</title> <p>The Messaging

    37 Application module has implemented all the functionality of standard IMAP4

    38 and conforms to RFC3501. </p> </section>

    39 <section id="GUID-572840C2-0ECC-4925-A42D-093E0043E07F"><title>IMAP4 example</title> <p>For more details on implementing

    40 the IMAP4 MTM functions, see <xref href="GUID-D73AD200-BE4D-50BF-BCF9-14627DE530B7.dita">example

    41 code</xref>. </p> </section>

    42 </conbody><related-links>

    43 <link href="GUID-1F755804-70D6-5635-B2F7-06F03C8D4B74.dita"><linktext>IMAP4 MTM</linktext>

    44 </link>

    45 </related-links></concept>