Re: Is it possible to require authentication based on specific properties of the MUA or its connection?

[Wietse Venema]

Noel Jones:
> To use more robust username/password authentication, you must use
> SMTP AUTH, which of course requires mail be submitted via SMTP
> rather than sendmail(1).

For submnission with /usr/sbin/sendmail:

/etc/postfix/main.cf
    authorized_submit_users = !uid-of-hacked-acount, static:all

This excludes mail from the hacked account.

        Wietse