expmail/config.dist.php

<?php

$MAIL_HOST = "localhost";
$MAIL_USER = ""; // Leave blank to not use authentication
$MAIL_PASS = "";
$MAIL_STARTTLS = false;
$MAIL_SMTPS = false;
$MAIL_PORT = null; // Default: 587 (no encryption/STARTTLS), 465 (SMTPS)

$MAIL_FROM_MAIL = "noreply@expmail.example"; // Leave blank to use $MAIL_USER
$MAIL_FROM_NAME = "EXPMail";

$API_KEYS = [
    "verysecretstring"
];