ISPs blocking SMTP connections from dynamic IP address space

[Bill Campbell]

On Mon, Jun 07, 2004, Bill Campbell wrote:
>On Mon, Jun 07, 2004, Jay Moore wrote:
>>On Monday 07 June 2004 10:29 am, Bill Moran wrote:
>>
>>> > Just make sure they are truly dynamic ips.  Many people block ips
>>> > identified as "DSL" connections.  Those are not necessarily dynamic ip
>>> > based.
>>
>>The easiest way I've found to learn if your IP address is "listed", and who is 
>>listing it is:
>>
>>http://www.dnsstuff.com/
>
>Telnet to port 25 of any of AOL's MX servers.  You will get an
>immediate rejection notice if they think you're in residential
>DSL space:
>	mailin-01.mx.aol.com
>	mailin-02.mx.aol.com
>	mailin-03.mx.aol.com
>	mailin-04.mx.aol.com

There is an excellent article in The Register on this very topic:
	http://www.theregister.co.uk/2004/06/04/trojan_spam_study/

Bill
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