The testing links are frinter.co/testingmail.com & frinter.cotestmail.php but they are unable to send mail.
The direct mail from zoho login is working I tested that. But using phpmailer is not working.
include('/usr/share/php/libphp-phpmailer/class.phpmailer.php');
include('/usr/share/php/libphp-phpmailer/class.smtp.php');
$mail = new PHPMailer;
$mail->SMTPDebug = 3; // Enable verbose debug output
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'mx.zoho.com'; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Password = '---somepassword----'; // SMTP password
$mail->SMTPSecure = 'TLS'; // Enable TLS encryption, `ssl` also accepted
$mail->Port = 25; // TCP port to connect to
$mail->addAddress('any email ID'); // Add a recipient
$mail->WordWrap = 50; // Set word wrap to 50 characters
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = 'Here is the subject';
$mail->Body = 'This is the HTML message body <b>in bold!</b>';
$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';
if(!$mail->send()) {
echo 'Message could not be sent.';
echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
echo 'Message has been sent';
include('/usr/share/php/libphp-phpmailer/class.phpmailer.php');
$mail = new PHPMailer();
$body = 'rjhrsjhtyjryjrjtrt';
$mail->SMTPDebug = 3;
$mail->IsSMTP();
$mail->SMTPAuth = true;
$mail->Host = "smtp.zoho.com";
$mail->Port = 587;
$mail->Password = "---some password---";
$mail->SMTPSecure = 'ssl';
$mail->AddReplyTo("---some Email Id---"," Support");
$mail->Subject = "Demo";
$mail->AltBody = 'erhbrstrtshgrt6';
$mail->MsgHTML($body);
$address = $email;
$mail->AddAddress($email);
$mail->Send();