Open Relay Checker before Opening MTA

[Kim Holburn]

Try using http://www.orbz.org/, they have a quite good list.  
They run tests on open relays and keep a list.  

There is also http://www.rfc-ignorant.org  They check for the existance of postmaster and abuse users and a number of other things.

The problem I've found is if your mail is relayed by a postbox.  sendmail won't run checks right through the Received: header.

Kim

At 12:58 AM 10/02/2002 +1100, Neil Symons wrote:


>I wonder if there is already something like this out there before I write one myself.
>
>
>When a mail server connect to me, I check my local blacklist to see if server is listed as an open relay, if not, then check my goodlist, if not there then connect straight back at them and do a open relay test.
>
>If all successfull, then accept connection and open real Mail Transport Agent (Mail server) and carry on through the e-mail. And add them to my Goodlist
>
>If it is found to be open relay, then REJECT e-mail and also e-mail postmaster of domain about what happended.
>Add site to local blacklist.
>
>Once per day/week/month go through each blacklist and whitelist to check if open relay and adjust accordinly.
>
>Even though this may use up bandwith, it will at least be less than the amount of junk mail received these days.
>
>
>Does anyone have any suggestions to whether this is a practical thing to do, or simply a stupid thing to do?
>
>Open for FLAME / SUGGESTIONS / POINTERS / DISCUSSION
>
>-- Neil
>
>
>-- 
>+----------------------------------------------------------+
>> Neil Symons <neil at goldweb.com.au>                        <
>> Goldweb Internet - (02) 62530059 BH  (0500) 528932 AH    <
>> ICQ / UIN: 5255597 |  http://www.goldweb.com.au/~neil/   <
>+----------------------------------------------------------+

--
Kim Holburn  Network Consultant  P: +61 2 61258620 M: +61 0417820641
Email: kim.holburn at anu.edu.au - PGP Public Key on request

Life is complex - It has real and imaginary parts.
     Andrea Leistra (rec.arts.sf.written.Robert-jordan)