(IOS) 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")”.

Download: Chilkat IOS (IPhone) Objective-C Libraries

NSMutableString *strOutput = [NSMutableString stringWithCapacity:1000];

CkoImap *imap = [[[CkoImap alloc] init] autorelease];

BOOL success;

//  Anything unlocks the component and begins a fully-functional 30-day trial.
success = [imap UnlockComponent: @"Anything for 30-day trial"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Connect to they Yahoo! IMAP server.
success = [imap Connect: @"imap.mail.yahoo.com"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Send the non-standard ID command...
NSString *rawResponse;
rawResponse = [imap SendRawCommand: @"ID (\"GUID\" \"1\")"];
if (rawResponse == nil ) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Login
success = [imap Login: @"myLogin" password: @"myPassword"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

[strOutput appendString: @"Login Success!"];
[strOutput appendString: @"\n"];

//  Select an IMAP mailbox
success = [imap SelectMailbox: @"Inbox"];
if (success != YES) {
    [strOutput appendString: imap.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

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

//  Disconnect from the IMAP server.
[imap Disconnect];

self.mainTextField.stringValue = strOutput;