Outbound spam protection , guidance require.

[Valentin Laskov]

Hi Jayesh,

I suppose these emails are not sent by your mail server. You must configure 
your router's firewall to prevent sending emails from stations in the LAN to 
Internet. If this is a Linux router you must type as root

iptables -I FORWARD -p tcp --dport 25 -j DROP

You may need to specify network ( -s 192.168.0.0/24 ) or interfaces ( -i 
eth0 -o eth1 ) in the rule above.

cheers
Valentin

----- Original Message ----- 
From: "jayesh shinde" <jayesha_shinde at yahoo.com>
To: <mailscanner at lists.mailscanner.info>
Sent: Thursday, August 07, 2014 3:24 PM
Subject: Outbound spam protection , guidance require.


Hi ,


My server handling outgoing traffic of 2 lakhs = 200,000 (max) emails per 
day .


Some time due to virus infection or password hacking , spammers are sending 
many thousand of email within short time. Which at the end causing to 
blacklist my outgoing IP spool. I am using rate limiting ,strong password 
etc ... but still due to such issues business is getting disturb.


Want to is there any paid / opensource spam database available which will 
scan the outgoing email traffic ( not incoming ) from LAN / Wan and that can 
be integrate within MailScanner + Spamassassin or only with postfix MTA ? 
Which can detect and block the bulk / spam emails in realtime and have Low 
false positive rate .


What is best practice others are following for such scenario ?

Regards
Jayesh


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