Phpmailer: how to do mass mailing?

Question

PHP

Hi all!
I'm trying to do mass mailing but it doesn't work.
Here is the error
ErrorSMTP Error: Data not accepted. SMTP server error: 5.7.1 Message rejected under suspicion of SPAM; https://yandex.ru/support/mail/spam/honest-mailers.xml 1460734462-Z5k54JZeXJ-YK6GcjG6
What should I do to make it work.
By the way, the code is on hosting. There is no domain name.

$mail = new PHPMailer(true);
$send_using_gmail = true;
//Send mail using gmail

if($send_using_gmail){
    $mail->IsSMTP(); // telling the class to use SMTP
    $mail->SMTPAuth = true; // enable SMTP authentication
    $mail->SMTPSecure = "ssl"; // sets the prefix to the servier
    $mail->CharSet  = 'UTF-8';
    $mail->Host = "smtp.yandex.ru"; // 
    $mail->Port = 465; // set the SMTP port for the GMAIL server
    $mail->Username = "[email protected]"; // 
    $mail->Password = "g21"; // 
}

$msg_title = "dfdfd";
$msg_body = "dfdfdf";
/
$emails = [....]; // тут ассоциативный массив емайл=>Фио 
foreach($emails as $k=>$v)
$mail->AddAddress($v, $k);

$mail->AddReplyTo("[email protected]","TEST");
$mail->SetFrom("[email protected]", "Infoarmation (Test)");
$mail->Subject =$msg_title;
$mail->Body = $msg_body;

try{
    $mail->Send();
    echo "Success!";
} catch(Exception $e){
    //Something went bad
    echo "Fail - " . $mail->ErrorInfo;
}

Answer 1

Yandex prohibits mass mailings, especially from regular mailboxes.
Provide at least the text of the letter.

Answer 2

Here is an article about free mailing services: link
I used MailGun myself.