[dns-wg] rMX and rDNS together make spamming more difficult ?

Hi

Feedback:
Your idea sounds just like any other blacklisting, except for that you want
to deny anybody by default instead and add the ones you want to accept.
Thats sounds like a huge project, maybe too huge.

What would you really want to accept on your list?
There are countries allowing spam, and there are countries partly allowing
it. I do not want to block the "legal" spam. Would you add "legally"
spamming companies?
Spammers using compromised systems to spam is another thing. That sure is
one annoying problem...
I do not think you have the general solution, and I don't have any ideas for
one either.
But keep it brainstorming!

Best regards,
Joergen Hovland


If you want to know how we try to stop spam:
We are currently handling spam by blocking all known dialups/dhcp ranges.
On top of that we block entire countries (or all countries except for the
ones on the list) per emailaccount decided by the customer.
This blocking is based on the IP-address of the remote-mailserver trying to
send us the email.
My own email blocks every country except UK, Netherlands, USA and
Scandinavia.


----- Original Message ----- 
From: <use.signature.ripe at awot.fi>
To: <dns-wg at ripe.net>
Sent: Thursday, November 27, 2003 3:55 PM
Subject: [dns-wg] rMX and rDNS together make spamming more difficult ?


> My idea is check senders (MTA s) ip and priviledges to use smtp, not using
protocol headers or other content filtering method. My idea is control
connection (ip) using reverse dns lookup database, not dns lookup. My
proposal include also method to handle roaming mta.
>
> Mail sending is done from ip, not from domain.
>
> Reverse dns is mostly controlled by operators and "big companies", so we
have less players as in domain structure and I believe that it is easier to
make "operator blacklist" as domains.
>
> This idea is simple (too simple to be true ? That I m asking) to add every
access control level : firewall, proxies, filters, wrappers, smtp servers,
...
>
> Proposal rMX using rDNS:
>
http://www.awot.fi/sf/browser/showfile?cust=awkoulutus&subdir=dns&doc=reverse_mx
>
> I m waiting feedback, have I missed something ?
>
> -jukka-
> Jukka do.t Inkeri at Awot  do.t Fi
>