Envoyer des courriels en SMTP via Gmail avec PHPMailer

Après avoir passé à Google Apps, j’ai cherché comment envoyer des courriels en SMTP via Gmail à partir d’un script PHP. Voici la solution avec PHPMailer:

require_once "class.phpmailer.php";

$mailer = new PHPMailer();

$mailer->IsSMTP();  // telling the class to use SMTP
$mailer->Username = "username"; // gmail username
$mailer->Password = "password"; // gmail password
$mailer->Host = "smtp.gmail.com"; // SMTP server
$mailer->Port = 465;
$mailer->SMTPSecure = 'ssl';
$mailer->SMTPAuth = true;

$mailer->FromName = "From";
$mailer->From = "from@example.com";
$mailer->AddAddress("to@example.com");

$mailer->Subject  = "My SMTP message with Gmail";
$mailer->Body     = "Hello world!";
$mailer->WordWrap = 50;

if (!$mailer->Send()) {
    echo 'Message was not sent.';
    echo 'Mailer error: ' . $mailer->ErrorInfo;
} else {
    echo 'Message has been sent.';
}