DH_Alumni/submit.php

<?php

if ($_SERVER['REQUEST_METHOD'] != "POST") {
    die();
}

require_once 'general.php';
require_once 'vendor/autoload.php';

use PHPMailer\PHPMailer\PHPMailer;

$name = $_POST['name'];
$mail = $_POST['mail'];
$year = $_POST['year'];
$birthday = $_POST['birthday'];
$vocation = $_POST['vocation'];
$privacy = $_POST['privacy'];

//validate here



$config = getConfig();

$mail = new PHPMailer(true);

$mail->isSMTP();
$mail->SMTPAuth = true;
$mail->Host = $config['mail_server'];
$mail->Port = $config['mail_port'];
$mail->Username = $config['mail_user'];
$mail->Password = $config['mail_password'];

$mail->From = $config['mail_address'];
$mail->FromName = 'Mailer';
try {
    $mail->addAddress('test@joethei.de', 'Joe User');
} catch (\PHPMailer\PHPMailer\Exception $e) {
}

$mail->Subject = 'Here is the subject';
$mail->AltBody = 'Message without html';
$mail->Body    = 'This is the HTML message body <b>in bold!</b>';


try {
    !$mail->send();
} catch (\PHPMailer\PHPMailer\Exception $e) {
    echo $e;
}