/** Sends transactional email via SMTP when configured; the caller decides what to do when this
 * returns false (e.g. log the link so an admin can hand it to the user manually). */
export async function sendMail({ smtpUrl, from, to, subject, text }) {
	if (!smtpUrl) return false;
	const { default: nodemailer } = await import("nodemailer");
	const transporter = nodemailer.createTransport(smtpUrl);
	await transporter.sendMail({ from, to, subject, text });
	return true;
}