That may not actually be the server handling the mail though. It's rather common to have a sendmail/postfix mail forwarder on the outside that forwards all mail to/from the Exchange server on the inside.
These sorts of solutions always seem to pop up on slashdot and they do work rather well if you're doing anti-spam or anti-anything for a small group of people whom you know. I run a small mail server for a group of friends and I can blacklist whole sections of APNIC space because there's no reason that anyone would be getting anything legit from Asia.
The problem that is always overlooked is that this solution does not scale at all. I can't use the same sorts of schemes at work where I have 10's of thousands of emails going through every day from all over the globe. I don't know what each and every user wants and I sure as hell don't know where my legit mail may come from and what it might say. In addition when you are in a buisiness situation the loss for one incorrectly blocked email is much greater than the loss for any number of spam. So, at work I am relegated to using SpamAssassin and tweaking it as much as I can. Of course there is a much higher level of spam at work, but it's the best I can do.
The companies providing the IP TTY services are in much the same situation. While they should (and eventually must) provide some sort of filtering/blocking they aren't at liberty to do the same wholesale blocking that people can do if they are running a small server for a family.
Odin S.
O:)(:C
Slashdot Mirror
That may not actually be the server handling the mail though. It's rather common to have a sendmail/postfix mail forwarder on the outside that forwards all mail to/from the Exchange server on the inside.
These sorts of solutions always seem to pop up on slashdot and they do work rather well if you're doing anti-spam or anti-anything for a small group of people whom you know. I run a small mail server for a group of friends and I can blacklist whole sections of APNIC space because there's no reason that anyone would be getting anything legit from Asia. The problem that is always overlooked is that this solution does not scale at all. I can't use the same sorts of schemes at work where I have 10's of thousands of emails going through every day from all over the globe. I don't know what each and every user wants and I sure as hell don't know where my legit mail may come from and what it might say. In addition when you are in a buisiness situation the loss for one incorrectly blocked email is much greater than the loss for any number of spam. So, at work I am relegated to using SpamAssassin and tweaking it as much as I can. Of course there is a much higher level of spam at work, but it's the best I can do. The companies providing the IP TTY services are in much the same situation. While they should (and eventually must) provide some sort of filtering/blocking they aren't at liberty to do the same wholesale blocking that people can do if they are running a small server for a family. Odin S. O:)(:C