Problème pour envoyer un mail en php

Bonjour les amis,

j'ai besoin de votre aide car actuellement j'ai un problème pour envoyer un mail via php. Voici mon code:
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index.php

<label>
<span>Nom*:</span>
<input type="text" placeholder="Entrez votre nom" name="name" id="name"/></label>

<label>
<span>Email*:</span>
<input type="email" placeholder="***@***" name="email" id="email"/>
</label>

<label>
<span>Message:</span>
<textarea name="monmessage" id="monmessage" rows="4" cols="50"></textarea>

</label>

<input class="sendButton" type="submit" name="Submit" value="Envoyer"/>

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envoyer.php

<?php

ini_set("SMTP", "smtp.name.com");

// Get values from the form
$name=$_POST['name'];
$email=$_POST['email'];
$monmessage=$_POST['monmessage'];

$to = "monmail@.com";
$subject = "Sujet";
$message = " Name: " . $name . $email . "\r\n Monmessage: " . $monmessage;

$headers = "From:" . $email . "\r\n";
$headers .= "Content-type: text/plain; charset=UTF-8" . "\r\n";

if(@mail($to,$subject,$message,$headers))
{
echo "You comment has been sent successfully ! thank you for your comment!";
// Created by Future Tutorials
}else{
echo "Erreur! your comment have not been sent successfully! Try .";
}