[lug] Responsible Black Hole Lists

[George Sexton]

Ben wrote:
> I use spamhuas.org -- In postfix main.cf, I've got the line:
> 
>        reject_rbl_client zen.spamhaus.org
> 
> in smtpd_sender_restrictions =
> 
> I haven't any problems with false positives. The nice thing about it (as 
> opposed to later filtering via spamassassin and the like) is that it 

I'm going to give SpamHaus a try. and see how it goes.

I think I really need to follow through with my idea of creating 
real-time black hole lists. IOW, seed my web pages with Invisible text 
containing special Email Addresses and then whenever one of those Email 
addresses receives a message, add the address to a black-hole list.

> rejects the e-mail and the sender gets a bounce. If it is a real e-mail, 
> then  human will get the bounce and know it didn't go through. I've also 
> had great results using helo_required and helo_restrictions and the like 
> to reject mail from servers not following the standard protocol. It has 
> greatly reduced the spam that my filters have to deal with. For some 
> numbers, for every e-mail that gets in (or out, so I'm overcounting 
> received e-mails), 1 gets rejected by spamhaus, and 2.2 get rejected by 
> helo restrictions and the like. In total, 24% of attempts make it past 
> the front door.
> 

I'm using SPF and Fully Qualified Domain Name required for HELO, and on 
one domain for TODAY (noon), SPF caught 300 messages and HELO caught 650.


-- 
George Sexton
MH Software, Inc.
Voice: +1 303 438 9585
URL:   http://www.mhsoftware.com/