[NTLUG:Discuss] All non-US IP list?
. Daniel
xdesign at hotmail.com
Tue Jul 3 08:55:12 CDT 2007
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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