Re: Reasons spammers like .biz?

[Eugene Morozov <ka...@online.ru>]

codger <li...@pmbx.net> writes:

> For some time there has been a setting in CommunIGate Pro to only
> accept domains that have proper rDNS entries so that the mail server
> MUST verfy a real rDNS at the SMTP level. That's the only thing that I
> can see that will stop invisible domains.

Hello,
This was discussed several times, for example, in
Russian newsgroups. It was concluded that rejecting
domains without rDNS entries will block some spam, but
it will also cause too many false positives.
Eugene

-- 
Spammers, send me mail here: kaede.news@online.ru, akrosum@yahoo.com

Re: Reasons spammers like .biz?

[codger <li...@pmbx.net>]

The rDNS is not intended to block spams per se but to keep them from 
being hidden as the article quoted in the original post discussed. I 
didn't mean to reopen the rDNS debate at all. I meant merely to state 
spammers who 'hide' from traceroute and whois (as that article 
discussed) can't do so when an rDNS done during SMTP at the mail server 
level. That should make this ploy of being 'invisible' to those methods 
of spammer discovery essentially useless, if I'm reading that article 
correctly.

Original article: 
http://www.merit.edu/mail.archives/nanog/2003-10/msg00438.html

On Feb 26, 2004, at 1:25 AM, Eugene Morozov wrote:

> codger <li...@pmbx.net> writes:
>
>> For some time there has been a setting in CommunIGate Pro to only
>> accept domains that have proper rDNS entries so that the mail server
>> MUST verfy a real rDNS at the SMTP level. That's the only thing that I
>> can see that will stop invisible domains.
>
> Hello,
> This was discussed several times, for example, in
> Russian newsgroups. It was concluded that rejecting
> domains without rDNS entries will block some spam, but
> it will also cause too many false positives.
> Eugene
>
> -- 
> Spammers, send me mail here: kaede.news@online.ru, akrosum@yahoo.com
>
>

Kindest regards,

Ron

"What shall we do? What shall we do?" he cried, "Escaping goblins to be 
caught by wolves!" - Bilbo Baggins

The Hobbit by J. R. R. Tolkein
http://www.apple.com/trailers/newline/returnoftheking/trailer_large.html