[Dshield] ISP's blocking dynamic IP address mail servers

Laura Vance vancel at winfreeacademy.com
Wed Apr 21 15:44:46 GMT 2004


I'm not sure if this is the right list, but I believe it is a result of 
all of the attacks to port 25 that have been happening.

I am a very responsible mail administrator both at work and at home.  I 
run a mail server at home, because I like having more control over my 
email account than I would have with an online mail provider such as 
yahoo mail. (there are several other reasons too)  As a result, my home 
server is on a dynamic IP address (cable modem).  I'm sure there are 
others that run their own mail server for the same reasons that I do.

I've seen discussions on here about email blacklists, and based on the 
threads, it seems like responsible mail providers should not block IP 
ranges simply because they are dynamic, but they should be able to make 
checks based on the individual mail server. (such as how they handle 
bounce vs reject, do they allow relay, etc.)  My mail server at home 
(and at work) does not allow relay and uses the "reject" method for 
unknown local accounts as has been deemed the more Internet-friendly way 
of doing business.

Now for the thing that I'm curious about, and the reason for the post to 
this mailing list.  Is there any way to get ISP's (prodigy and sbcglobal 
(I believe they're the same company now)) to implement a better way of 
spam blocking than just the wholesale blacklist of IPs simply because 
they are dynamic?  Any ideas that I have had would never be able to be 
accomplished by a single person since they all involve trying to point 
out better ways for them to control spam and virus traffic.  Corporate 
America gets a policy in place, and they do anything they can to keep it 
there, regardless of any negative impact.

I wonder if this was the goal that the smtp virus writers had in mind:  
eliminate all trust for dynamic IP mail servers.

Laura Vance
Systems Engineer
Winfree Academy Charter Schools, Data-Business Office
1711 W. Irving Blvd. Ste 310
Irving, Tx  75061
Web: www.winfreeacademy.com

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