(PHP Extension) Yahoo! IMAP (imap.mail.yahoo.com)

(from Wikipedia)

It is possible to get direct IMAP access without signing up for paid access nor using software like YPOPs! or FreePOPs. Yahoo! operates IMAP and secure IMAP servers (imap.mail.yahoo.com in particular), which are globally accessible. However they require a specific, non-standard IMAP command to be sent before login is done, namely: “ID ("GUID" "1")”.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$imap = new CkImap();

// Connect to they Yahoo! IMAP server.
$imap->put_Port(993);
$imap->put_Ssl(true);
$success = $imap->Connect('imap.mail.yahoo.com');
if ($success != true) {
    print $imap->lastErrorText() . "\n";
    exit;
}

// Send the non-standard ID command...

$rawResponse = $imap->sendRawCommand('ID (\'GUID\' \'1\')');
if ($imap->get_LastMethodSuccess() != true) {
    print $imap->lastErrorText() . "\n";
    exit;
}

// Login
$success = $imap->Login('myLogin','myPassword');
if ($success != true) {
    print $imap->lastErrorText() . "\n";
    exit;
}

print 'Login Success!' . "\n";

// Select an IMAP mailbox
$success = $imap->SelectMailbox('Inbox');
if ($success != true) {
    print $imap->lastErrorText() . "\n";
    exit;
}

// Continue with whatever you wish to do...
// (see other examples..)

// Disconnect from the IMAP server.
$success = $imap->Disconnect();

?>