[GLLUG] Is my email server an open relay?

[Phillip Hofmeister]

To the question: are you an open relay:

plhofmei at Oneill:~$ telnet 68.79.83.171 25
Trying 68.79.83.171...
Connected to 68.79.83.171.
Escape character is '^]'.
220 cwhq.net ESMTP
HELO hi.com
250 cwhq.net
MAIL FROM: <me at yahoo.com>
250 ok
RCPT TO: <jd at msn.com>
553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

any SMTP connections from 65.73.148.231 was me testing to see if you are
an open relay.  Please disregard these connections.


On Fri, 09 Jul 2004 at 12:11:38AM -0400, Seth Bembeneck wrote:
> I'm running qmail on a Gentoo system.
> 
> My ip is dynamic.
> 
>  
> 
> Some mail is going out, others I'm getting a message about DNSBL when
> sending to email addresses @sbcglobal.net
> 
>  
> 
>  
> 
> One of the websites (http://openrbl.org/) listed my current IP as on the
> list and said this:
> 
>  
> 
> "IP address 68.79.83.171 is listed here as ameritech.net misc.spam. 
> 
> The misc.spam group is mostly (but not entirely) composed of entire
> addresses blocks that have a) sent spam here, b) have consecutive or missing
> reverse dns, and c) have no customer sub-delegation via either the
> controlling RIR (ARIN, RIPE, LACNIC, APNIC, etc) or an rwhois server
> referenced in the main RIR records.
> 
> In particular, 68.79.83.171 has reverse dns of
> adsl-68-79-83-171.dsl.sfldmi.ameritech.net. If your domain name does not
> appear as the last components in any of those reverse dns names, that needs
> to be fixed first. Any email sent to the address at the top of this page
> will be ignored until that is fixed. "
> 
> What does that last paragraph mean?
> 
>  
> 
> How can I test to see if I'm an open relay?
> 
>  
> 
> If I am an open relay, How can I make it so that I'm not?
> 
>  
> 
> I got my domain from easyDNS.com, I didn't have this problem when I used
> DynDns.org's services for free sub-domain (don't know if this info makes a
> difference).
> 
>  
> 
> Any other info that would help?
> 
>  
> 
> Thanks,
> 
>  
> 
> Seth
> 

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-- 
Phillip Hofmeister

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