9fans archive / 2000 / 07 / 66 /    prev next

From: bobf@pla...
Subject: Re: [9fans] norelay option in /mail/lib/smtpd.conf
Date: Tue, 4 Jul 2000 11:05:34 -0400

> If we are allowed to write:
> relay			off	# disallow relaying
> it will be more clear for everyone.

that's reasonable.  you can change the code in
/sys/src/cmd/upas/smtp/spam.c to reverse the
sense of the parse.

> By the way, smtpd can controll incomming mails
> using sender-receiver address pair.
> Therefore relay filter using the pair will be more powerful.

no, the sender domain is easily forged.  almost all relay
probes that we see claim to be from our domain.  the peer ip
address is more difficult to forge, so we use it.