RE: [MLUG] More spam

["Russell Horn" <EMAIL:PROTECTED>]

It was just a thought :) As for the reverse DNS, doesn't a reverse lookup
(at least using dig) give you all the DNS entries? Or, how about the
following:
Because you're sending an email from "mail.defenseindepth.net" couldn't you
do a lookup on that account, and if the originating IP address is the same,
accept it? I realize people sometimes use sendmail from a dialup connection,
but they could at that point just as easiliy use the standard smtp servers
of the ISP. Essentially, the thought here is to prevent "spoofing" of a from
field.
Anyway, just a few thoughts.
Jason


2 problems there - my dialup provider won't let me use their smtp server if
I alter the domain I am sending from - i.e. I can't send from albanach.com
via them. Secondly, what about organisations where the mailserver might be
on an internal network with a non routing IP say 10.0.10.1 - you can't do a
lookup on that.

Russell.

p.s. Interestingly, the first time I tried to send this I accidently used my
@snp.org email address. The MLUG mail server responded as follows:

<EMAIL:PROTECTED>: host mlug.missouri.edu[128.206.61.230] said:
553
    5.1.8 <EMAIL:PROTECTED>... Domain of sender address EMAIL:PROTECTED does
    not exist

So something is doing domain checking (though not very well as snp.org does
exist) on MLUG at the moment.


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