From owner-freebsd-security  Tue Jan 22  9:47:30 2002
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From: "Lawrence Sica" <lomifeh@hotmail.com>
To: "Roger 'Rocky' Vetterberg" <listsub@rambo.simx.org>,
	"Bart Matthaei" <bart@dreamflow.nl>
Cc: "Asep Ruspeni" <asepruspeni@yahoo.com>,
	<freebsd-security@FreeBSD.ORG>
References: <000101c19d18$57401d00$40c801ca@warhawk> <000801c1a31b$afe43e60$2e020a0a@mti.itb.ac.id> <20020122091048.K58243@heresy.dreamflow.nl> <3C4D2021.80006@rambo.simx.org>
Subject: Re: relaying mail from DHCP clients
Date: Tue, 22 Jan 2002 09:47:27 -0800
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----- Original Message -----
From: "Roger 'Rocky' Vetterberg" <listsub@rambo.simx.org>
To: "Bart Matthaei" <bart@dreamflow.nl>
Cc: "Asep Ruspeni" <asepruspeni@yahoo.com>; <freebsd-security@FreeBSD.ORG>
Sent: Tuesday, January 22, 2002 12:17 AM
Subject: Re: relaying mail from DHCP clients


>
>
> Bart Matthaei wrote:
>
> >On Tue, Jan 22, 2002 at 03:06:12PM +0700, Asep Ruspeni wrote:
> >
> >>my configurations :
> >>
> >>FreeBSD : mail server using sendmail
> >>Windows2000 : DHCP server
> >>
> >>need help :
> >>-my clients (which obtain IP from DHCP server) could'nt send mail using
MUA
> >>outlook express.
> >>the comment was :
> >>relaying denied, IP lookup failed [IP generated by DHCP server]
> >>
> >>question :
> >>how do i setup my sendmail configuration so my clients could send mail
from
> >>his/her MUA using smtp service in my freebsd box.
> >>
> >>thank you in advance.
> >>asep.
> >>
> >
> >First of all, I think this is a bit off-topic. But ill try to answer
> >anyway.
> >
> >After 2 min. of googling:
> >
> >FEATURE(accept_unresolvable_domains).
> >
> >Normally, sendmail will refuse to accept mail that has a return adress
> >with a domain that cannot be resolved using the regular host lookups.
> >(a technique commonly used by spammers).
> >This feature permits acceptance of such addresses.
> >Unresolvable domains can be selectively accepted using the access
> >database.
> >

This won't help for ip's.  All that does is turn of sendmail's reverse
lookup feature.  He needs to enable relaying not accepting mail for users...

This is a dangerous feature as it is, too bad too many mail servers dont
have a reverse dns ip address.

--Larry

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