IOS JSON sending an email from Mandrill

I have an IOS application that I would like to send an email via Mandrill. I have tried to implement this, but its not working and Ive confused myself. When pressing the button to send an email from the IOS application I log this error message: ``` {"status":"error","code":-1,"name":"ValidationError","message":"You must specify a key value"} ``` My code is: ``` NSString *post = [NSString stringWithFormat:@"{\"key\": \"abcdefg123456\", \"raw_message\": \"From: me@mydomain.com\nTo: me@myotherdomain.com\nSubject: Some Subject\n\nSome content.}"]; NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; [request setURL:[NSURL URLWithString:@"https://mandrillapp.com/api/1.0/messages/send-raw.json"]]; [request setHTTPMethod:@"POST"]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody:postData]; NSLog(@"Post: %@", post); NSURLResponse *response; NSData *POSTReply = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil]; NSString *theReply = [[NSString alloc] initWithBytes:[POSTReply bytes] length:[POSTReply length] encoding: NSASCIIStringEncoding]; NSLog(@"Reply: %@", theReply); ``` Please let me know where I am going wrong.