On Wed, Mar 05, 2003 at 07:58:26AM -0800, Michael Marking wrote:
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I'm not sure why open relays are useful now... don't all networks/ISPs
have local SMTP servers these days?
Some ISPs restrict use of their servers to those who have dialed in
from the ISP's own networks. Therefore, if you are a customer of ISP
X travelling away from home, you may not have access to that ISP's
SMTP servers. Even if you make arrangements to use a different ISP
while travelling, you may find when you arrive that the system doesn't
work (which can be very frustrating if you don't speak the language of
the country you are visiting).
Worse, thanks to the efforts of us (well, the anti-spam community)
there are now ISPs that don't allow you to use their outgoing SMTP
server with an e-mail address that is not in their domain. Pain
in the butt, and a great example of something that does more damage
to the utility of the open e-mail system than it does to stop spam.
I don't know if they have combined port 25 block/redirect with
"force you to use our domain" but that's coming next I fear.
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