On Sat, 24 Mar 2001, Jeremy C. Reed wrote:
> I want to block some emails that have a From or Sender with a
> @hotmail.com, @yahoo.com or @aol.com, but don't appear to be from a
> hotmail, yahoo or aol host (and are not sent from a mailing list I am
> subscribed to).
[...]
> Another example: I received an email from 44553200@??? that was
> sent from a mindspring host. I want to block it (since it is not from a
> host I approve or from an email I approve).
>
> I guess I will end up blocking legitimate mail, but I know I will block a
> lot of spam.
Why don't you just block all mail that is actually from mindspring? Yes,
you may block some legitimate mail, but at least who you block will be
able to put pressure on their provider to fix their spam problem. (I am
not actually suggesting that, but I do think that it is better than your
proposal.)
> Does anyone have any ideas or examples they can share?
When you say "From" you presumably mean the header from. If that is the
case, you can really only do this is a system filter.
One thing that I very strongly suggest you do is take a look at your logs
or produce a filter that will log only things that you wish to block. I
think that you will find that a substantial number of your own staff and
students send mail "forging" their hotmail addresses. Look at your
out-going mail of that form and ask yourself whether you would like other
sites to block those.
-j
--
Jeffrey Goldberg
I have recently moved, see
http://www.goldmark.org/jeff/contact.html
Relativism is the triumph of authority over truth, convention over justice
