RE: [FW1] SMTP relay & Spam mail problem

["Gilbert, David" <David.Gilbert@FW1-NOSPAMcitynational.com>]

Try the following resources (some old but useful):

http://www.microsoft.com/technet/exchange/relay.asp
http://support.microsoft.com/support/kb/articles/q196/6/26.asp
http://support.microsoft.com/support/kb/articles/q199/6/56.asp

Also, you can test your setup at: www.abuse.net

After all that, we found that until we changed a setting on FW1 SMTP
security server to accept mail to *yourhost.com the tests (above) showed it
would still be open for certain types of spaming.   Of course I don't have
POP3 users outside my fw :).    Havn't figured out if any of the SPs fixed
this, cause we did this with 4.1sp1 and we're on sp3 now.

-----Original Message-----
From: Mohan Sundar [mailto:mohi_v@hotmail.com]
Sent: Wednesday, May 23, 2001 4:35 PM
To: fw-1-mailinglist-digest@beethoven.us.checkpoint.com
Subject: [FW1] SMTP relay & Spam mail problem



Hi All,


     I have CheckPoint Firewall-1 ver 4.1 with SP3, Interscan Viruswall ver 
3.4 and MS Exchange server 5.5.
  I have SMTP resource (Viruswall) rule to scan all Inbound SMTP traffic. I 
have few POP3 users who  uses my Exchange server as a relay host. this setup

is working well without any problem.

  But few days back I came to know that somebody is using my Exchange server

as a relay host and generates Spam mails,I tried the following:

1.I enabled authentication for POP3 users in  Exchange server - it
  stopped Spam mail generation, but POP3 users not able to send mails.

2.I enabled " HOSTS AND CLIENTS CONNECTING TO THESE INTERNAL ADDRESS "
  option in Exchange server and specified my Exchange server IP address
  - Now The spam mail got started  but POP3 users able to send &
  receive  mails.

I need to restrict my Exchange server not to be used as relay host except my

autherised users, without disabling SMTP virus scanning.
Would like to hear your valuble suggestions.

Thanx in advance.

Regards,
MOHi

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