Normally, users should use ISP SMTP.
But sometimes it's not possible or not convenient to use (see examples section below).
We could allow users to use mail.nasqueron.org SMTP to send mail when they are authenticated.
That would mean:
When there is no TLS.
$ nc smtpout02.voo.be 587 (no reply) $ nc smtpout02.voo.be 25 220 smtpout02.voo.be ESMTP Postfix STARTTLS 502 5.5.1 Error: command not implemented
When you can't send mail without a carefully crafted FROM
554 5.1.8 <email@example.com>: Sender address rejected: Domain not found
554 <firstname.lastname@example.org>: Sender address rejected: Domain not found