[FW1] SMTP relay & Spam mail problem

["Mohan Sundar" <mohi_v@FW1-NOSPAMhotmail.com>]

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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