Re: Forged sender test

["Vince Puzzella" <vpuzzella@bluecatnetworks.com>]

I see you point and agree totally.  But a forged sender test option is
required by my spec.  I didn't come up with it and I don't have the
patience, time, and energy to convince the powers that be otherwise :).  I
was just wondering if I was missing something and it was possible without
any source code changes.

Thanks anyway.

----- Original Message -----
From: "Alexey Lobanov" <aal@evidence-cpr.com>
To: <zmailer@nic.funet.fi>
Cc: "Vince Puzzella" <vpuzzella@bluecatnetworks.com>
Sent: Saturday, January 11, 2003 3:30 PM
Subject: Re: Forged sender test


> Hi Vince,
>
> On 11 Jan 2003 at 14:49, Vince Puzzella wrote:
>
> > > Just note that you will reject a lot of legitimate mail.
>
> > I am aware of the potential pitfalls of such a test.  I was just
wondering
> > if it is at all possible.
>
> Everything is possible in open-source world, just "man vi" :-). Maybe,
those
> "pitfails" just explan why this idea is still not present in standard MTA.
Do
> you really want to reject mail from Yahoo (REAL Yahoo, not forged)?
> "...client=mta423.mail.yahoo.com[216.136.129.78]..."
>
> For comparison, examples of real client tests (Postfix MTA):
>
> 1. HELO name must be present in DNS as valid A or MX RR.
> 2. Reverse DNS must exist, including "paranoid check" IP->PTR->A.
>
> In my knowledge, all "well-maintained" mail systems satisfy those two
tests,
> and most (really most!) of garbage sources don't.
>
> Alexey
>
>
> > On 11 Jan 2003 at 9:52, Vince Puzzella wrote:
> >
> > From:           "Vince Puzzella" <vpuzzella@bluecatnetworks.com>
> > To:             <zmailer@nic.funet.fi>
> > Subject:        Re: Router file naming convention
> > Date sent:      Sat, 11 Jan 2003 09:52:08 -0500
> >
> > > Is there anyway to get the zmailer smtp server to test for forged
sender
> > > addresses at the MAIL FROM:<> phase?
> > > Essentially, I want to perform a DNS MX record query to verify that
the
> > > source IP is a valid mail exchanger for the sender's domain.
> >
> >
> >
> >
> > -
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> >
>
>
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