• RSS
  • Twitter
  • FaceBook

Exchange Server Forums

Forums | Register | Login | My Profile | Inbox | RSS RSS icon | My Subscription | My Forums | Address Book | Member List | Search | FAQ | Ticket List | Log Out

65,000 emails in one day....!

Users viewing this topic: none

Logged in as: Guest
  Printable Version
All Forums >> [Microsoft Exchange 2000] >> Server Security >> 65,000 emails in one day....! Page: [1]
Login
Message << Older Topic   Newer Topic >>
65,000 emails in one day....! - 25.Sep.2003 11:14:00 PM   
06scooter60

 

Posts: 29
Joined: 12.Oct.2000
From: Pacific Grove
Status: offline
Help,

I have 2 clients that have been overloaded with emails on there exchange server. I checked the Open Relay settings and everything is how it is supposed to be. I look at the "SMPT/Default SMTP Virtual Server/Queues" and find hundreds of queues running. I was able to flush them out with instructions given by a friend, but they still keep comming back... by the hundreds... Also the BadMail folder took 3 hours to delete. And now it is filling back up again. What is going on...?
Post #: 1
RE: 65,000 emails in one day....! - 26.Sep.2003 4:30:00 PM   
Henrik Walther

 

Posts: 6928
Joined: 21.Nov.2002
From: Copenhagen, Denmark
Status: offline
Hello 06scooter60,

Sounds like spammers who have "hijacked" one or more user accounts on your server, and use it/them to spam innocent people.

You should check your users for weak passwords immediately.

Also read:
http://www.vamsoft.com/orf/authattack.asp

Regards

(in reply to 06scooter60)
Post #: 2
RE: 65,000 emails in one day....! - 23.Feb.2004 8:54:00 PM   
Christ5340

 

Posts: 33
Joined: 12.Dec.2003
From: Dothan, AL
Status: offline
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 06scooter60)
Post #: 3

Page:   [1] << Older Topic    Newer Topic >>
All Forums >> [Microsoft Exchange 2000] >> Server Security >> 65,000 emails in one day....! Page: [1]
Jump to:

New Messages No New Messages
Hot Topic w/ New Messages Hot Topic w/o New Messages
Locked w/ New Messages Locked w/o New Messages
 Post New Thread
 Reply to Message
 Post New Poll
 Submit Vote
 Delete My Own Post
 Delete My Own Thread
 Rate Posts


Follow TechGenix on Twitter