How to send mail to abc@gmx.com

Question

Can't send mail to abc@gmx.com but my php code is working on another email like abc@gmail.com and abc@mailinator.com . I don't have solution of this please help me

    App::uses('CakeEmail', 'Network/Email');
    $To='abc@gmx.com'; 
    $email->to($To); 
    $email->from($From);
    $email->subject($Subject);
    $email->emailFormat('html'); 
    $email->attachments($attachment) ;
    $email->template($template);
    $email->layout = 'default';
    var_dump($email->send($message));
    if ($email->send($message))
    { 
        return true;
    } 
   else 
   { 
       return false; 
   }

Answer 1

Please check this code and check whether you are receiving mail from both the email id's

<?php
$to = "abc@gmx.com";
$subject = "Provide your subject matter";
$body = "This is test message!";
$headers = "From: sender@example.com" . "\r\n" .
"CC: abc@gmail.com";
mail($to,$subject,$body,$headers);
?>