[NTLUG:Discuss] All non-US IP list?

[. Daniel]

This is something of a follow-up on the previous discussion of blocking all 
chinese and korean IPs at the greylist filter.

I have followed the advice of list members here suggesting that I use 
spamassassin and rank the values of emails from certain countries higher.  
And that has certainly helped in one regard: The email is trapped and 
scanned on my MailScanner machine.  But let me tell you, while that is 
certainly effective, it's not enough.

Recently, I have been seeing emails coming from more countries than I can 
list in that particular set of rules.  Further, the sheer amount of email 
coming in and being processed is simply killing my server.  (Yes, I need a 
bigger server... maybe one day but not today.)  At some point, the box 
simply stops sending email on to my exchange server for reasons I have been 
unable to detect.  The sendmail queue just says "sending" and nothing is 
sent.  Rebooting the machine clears it up until the next time it gets 
congested like that.

Previously someone wrote a little perl script for me to parse through some 
IP addresses for china and korea in a way that is suitable for relaydelay.  
Obviously, this will help but isn't going to fix the larger problem.  Where 
before the majority of such traffic was coming from those two areas, now 
it's coming from all of Europe and South American countries.

I've been googling for lists of non-US IP addresses and there is no 
shortage of discussion on the topic.  (A lot of people offering what a bad 
idea it is and all that but without stating WHY it's a bad idea... not 
offering a scenario where it could be bad.)  In my case, this is a business 
that does business exclusively in Texas and exclusively for schools.  There 
is absolutely no business reason for incoming mail from outside Texas, let 
alone outside of the U.S.

If only I could get a list of non-US IP addresses, I would be a happier man.

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