• 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

Open Relay

Users viewing this topic: none

Logged in as: Guest
  Printable Version
All Forums >> [Microsoft Exchange 2000] >> Server Security >> Open Relay Page: [1]
Login
Message << Older Topic   Newer Topic >>
Open Relay - 4.Feb.2004 6:39:00 PM   
thaq

 

Posts: 7
Joined: 10.Jan.2004
From: Maryland, USA
Status: offline
Hi All,

I have been working with one Exchange 2000 server to fix open relay problem. I followed every commend and direction that are posted on the web and still unable to get around it. On the Default SMTP Virtual Server Properties, Access tab, Relay button, I have sellected/checked (as default) Only the list below and Allow all computers which successfully authenticate to relay, regurdless of the list above. I don't have any SMTP connector. I'm having 30-45 relay rejection a day. I changed the setting and took the check mark off from Allow all computers which successfully authenticate to relay, regurdless of the list above and still having same problem.

Is there any help out there...
Or am I missing any thing on DNS or AD, or my ISP is not filtering SMTP on upstream.

Thanks for quick suggestion..
Post #: 1
RE: Open Relay - 12.Feb.2004 4:03:00 AM   
Guest
you forgot to tell us if you actually have pop3 users offsite. if not you don't need that check mark and do you have a firewall or is your server on a public ip? cisco pix all the way dude. public ip's are bad on any server nowadays. where are you getting these relay rejections? event log? admin mailbox?

(in reply to thaq)
  Post #: 2
RE: Open Relay - 23.Feb.2004 8:48:00 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 thaq)
Post #: 3

Page:   [1] << Older Topic    Newer Topic >>
All Forums >> [Microsoft Exchange 2000] >> Server Security >> Open Relay 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