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

Doug White doug at clickdoug.com
Wed Apr 21 17:02:54 GMT 2004

I have a sbcglobal (sbcglobal, prodigy, yahoo) account and while they are
adding x-headers, they are blocking nothing other than virus mail.   I receive
a ton of spam from compromised dynamic boxes on that account.

That said, I do have a mail server on static IP numbers hosting 133 domains and
routinely block all dynamically assigned IP numbers worldwide.   If requested
by a client, I do whitelist specific servers which can be trusted. 99% of spam
we block has its origin from compromised boxes on dynamic IP numbers.

We can get rid of spam on your domain! , Anti-spam solutions
For hosting solutions http://www.clickdoug.com

----- Original Message ----- 

: Hello,
: 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.
: -- 
: Thanks,
: 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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