In your small ISP case, you would not publish information, but say in comcast's or optonline they would publish them.
Speaking as someone who uses such a "Dynamically Assigned" IP, I can
tell you I'd be royally pissed if Adelphia started blocking outbound
port 25 traffic. Here's why:
I have a laptop running Linux that I use for most of my email
correspondance. I use sendmail on this machine as my outbound mail
server. Why?
I use this machine all over the darned place, and got *really* tired of
having to reconfigure my email client every time I go to a different
client site (I often visit 4-5 in a day).
So I set up IMAPs for my incoming mail, and by using 'localhost' as my
outbound mail server, I never have to change my config.
If ISP's started blocking port 25 outbound except to their servers, I
would then be forced to change my config every time I move my system. Only a few clicks, but aggravating just the same.
As it is, AOL drives me insane because I can't send mail from my Cable Modem to AOL addresses because of their stoopid "Email originated from a dynamically assigned IP address" filter. So I have to bounce it off another server when I send to AOHell (which, fortunately, is very rare).
As the admin for a small ISP, I don't block anything outbound because I repect people's choice to do what they will with the connection they pay for. I do carefully review what comes _in_ on a regular basis, as well as post what's allowed in and what's not on the systsem's website. I do, however, watch fo rthe obvious, like large spikes in smtp traffic, or lots of outbound port 135 probes, and notify the affected luser of the problem. And I get cranky _only_ if they don't do the right thing, or simply don't respond.
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