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  3. April 2005

Re: And so it begins...

Joe Pluta wrote:
Okay, here's a new twist on the blacklist/whitelist concept.

I just sent an email to someone.  It didn't get through because the
recipient's ISP blocked it.  Why?  Because it didn't recognize me as an
ISP.  That is, this service no longer accepts mail from "end user"
accounts, which pretty much includes anybody running their own SMTP
server over a DSL line.  They give you a number of options, including
rerouting your mail through your ISP, or getting your ISP to change the
PTR record for your DSL address.  Otherwise, the user has to turn off
spam filtering.  As far as I can tell, this is purely a blacklist
approach, with no ability to whitelist a domain.  So any small business
running their own SMTP server over a DSL line is subject to this kind of
blacklisting.

Is this a sign of things to come? 

Joe -

What a timely question.  I just saw this eWeek opinion article yesterday:

http://www.eweek.com/article2/0,1759,1784276,00.asp?kc=ewnws041105dtx1k0000599

<Excerpt>

Opinion: The time has not only come for ISPs to block port 25 for consumer accounts, it has long since passed. The rewards for this and other ISP management techniques could be large, but ISPs need to be careful about how they do it and tell users why.

Do you run a mail server on your home Internet account? If you do, it's probably without your knowledge, such as in a mail worm or a zombie spambot. Few if any people running these programs intend to do so, and it's time for ISPs to close the door through which they operate.

I think there's a consensus developing among anti-spam researchers, many of them responsible for fighting spam on ISP networks, that unrestricted use of TCP port 25 must be shut down to the average Internet consumer. There are those who disagree, but their arguments sound obtuse and defeatist rather than actual justifications to not block port 25.

</Excerpt>

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