NodeJS Why doesn't SMTP server work with secure option?

Question

Email

const fs = require('fs');
const {SMTPServer} = require('smtp-server');

const smtp = new SMTPServer({
    secure: true,
    key: fs.readFileSync('certs/privkey.pem'),
    cert: fs.readFileSync('certs/cert.pem'),
    onData,
    onRcptTo,
    authOptional: true,
});

function onRcptTo(address, session, callback) {
    console.log("IS HERE!!!");
    callback();
}

function onData(stream, session, callback) {
    stream.pipe(process.stdout);
}

smtp.listen(465);

Without secure and, accordingly, port 25, everything works, but it doesn’t.
I received the certificate in let's encrypt via certbot, I also tried not to install it separately and leave it by default, but everything is empty there too.

With secure enabled, sent for verification (mxtoolbox.com) <- here and (check.smtp.bz) <- here, in both cases it returned "Unable to connect (address)"