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Help! - 23.Feb.2004 11:45:00 AM   
DSSL

 

Posts: 5
Joined: 10.Nov.2003
From: London
Status: offline
Hi everyone! Hope some one can help me!

My customer has loads and loads of differect que's in ms exchange 2000! I'm guessing someone is useing their sever as a spam server! Any ideas on how i can bar them from doing this!

Thanks for your help in advance

Nel
Post #: 1
RE: Help! - 23.Feb.2004 8:55:00 PM   
Christ5340

 

Posts: 33
Joined: 12.Dec.2003
From: Dothan, AL
Status: offline
Make sure you aren't an Open Relay.

Also,
Turn on SMTP logging(all fields), what a couple of days, then import those text(log) files into Excel or Access and sort based on IP, grouping by counting and you can see which IP's are hitting you the most. For the IP's and domains that you don't recognize, check that IP address using ARIN, http://ws.arin.net/cgi-bin/whois.pl and see where the registrar is located. Most likely will be Asia, SA, or Europe if it's spam ore relay attemtps. I had this same problem, did what I've discussed and blocked the following netblocks at my Cisco Internet router using access-list 100 deny ip host xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx any
I blocked the following netblocks which include most all of Asia, some European, and some known US spammers and my spam is 99.999% gone.
deny ip 202.0.0.0 0.255.255.255 any
deny ip 203.0.0.0 0.255.255.255 any
deny ip 217.0.0.0 0.255.255.255 any
deny ip 218.0.0.0 0.255.255.255 any
deny ip 219.0.0.0 0.255.255.255 any
deny ip 220.0.0.0 0.255.255.255 any
deny ip 221.0.0.0 0.255.255.255 any
deny ip 222.0.0.0 0.255.255.255 any
deny ip 188.0.0.0 0.255.255.255 any
deny ip 80.0.0.0 0.255.255.255 any
deny ip 81.0.0.0 0.255.255.255 any
deny ip 82.0.0.0 0.255.255.255 any
deny ip 60.0.0.0 0.255.255.255 any
deny ip 61.0.0.0 0.255.255.255 any
deny ip 62.0.0.0 0.255.255.255 any
deny ip 210.0.0.0 0.255.255.255 any
deny ip 211.0.0.0 0.255.255.255 any
deny ip 212.0.0.0 0.255.255.255 any
deny ip 213.0.0.0 0.255.255.255 any
deny ip 193.0.0.0 0.255.255.255 any
deny ip 194.0.0.0 0.255.255.255 any
deny ip 195.0.0.0 0.255.255.255 any
deny ip 38.0.0.0 0.255.255.255 any
deny ip 43.0.0.0 0.255.255.255 any
deny ip 133.0.0.0 0.255.255.255 any
deny ip 83.0.0.0 0.255.255.255 any

(in reply to DSSL)
Post #: 2

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