Re: Bounce Settings

On Thu, 6 Jan 2005 15:08 +0000 (GMT Standard Time), Leslie <spam@spam.teamaker.net> may have written:
>
> I have a dedicated box with my ISP and they provide QMail as standard and
> their own control panel to configure it.
>
> However, one of their settings for 'catch all' is to 'Bounce' the mail if
> a recipient isn't recognised.
>
> Now, it seems the way they have set it up is that if a domain is enabled
> on the mail server but a mailbox or forward rule is not present for that
> recipient, it still accepts the mail and then rejects and bounces it from
> its own Mailer Daemon, causing it to be effectively an open relay for
> spammers who use fake from fields.
>
> They say :-
>
> The structure of qmail does not allow the bounce of messages at the smtp
> level if a mailbox does not exist, it first has to accept the message and
> then check to see if there is a mailbox to deliver to.
>
> Is this so?

It is so. People have since written patches to qmail to allow for this behavior. Google
for realrcptto and goodrcptto for information regarding those patches. Also, there are
qmail-smtpd replacements such as mailfront and qpsmtpd that accomplish these features
without the need to patch qmail.

Cheers,
--
Brian T Glenn
delink.net Internet Services