On 24 Aug 2006 at 20:26, Gary VanderMolen wrote:

> AFAIK, most ISPs no longer permit dynamic IP clients to run mail servers.

I think you missed my point, specifically that a large percentage of the 
problem comes from zombie bots on dynamic ip machines. Since many isp's now 
block outbound port 25 on consumer connections, many of the malware programs 
will use random ports to get around the isp smtp blockage.

Also if one wants to run a mail server on a dynamic connection, there is 
generally nothing stopping you, AUP and port 25 blocking notwithstanding.

Get a free dyndns.org account, set the mailserver to run on a different port 
and you are pretty much good to go.

There are very few isp's who actually use deep packet inspection that would 
catch the smtp traffic running on other nonstandard ports.

Now with that said, there are other standard smtp ports that very few isp's 
block, the message submission port on 587 being one.  Plus there are ssl/tls 
ports like 465 etc.
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