$mail->CharSet = 'utf-8';
$mail = new PHPMailer();
$mail->IsSMTP();
$mail->Host = "mail.alanadi.com";
$mail->SMTPAuth = true;
$mail->CharSet = 'utf-8'; 
$mail->Username = "mail@alanadi.com";
$mail->Password = "sifreniz";
$mail->From = "mail@alanadi.com";
$mail->Fromname = $_POST['isim'];
$mail->AddAddress("gidecekolan@mailadresi.com","Mail gönderimi");
$mail->Subject = $_POST['konu'] . $_POST['eposta'];
$mail->Body = $_POST['mesaj'];