Friday, March 30, 2007
I have seen more often these days, people asking about how to stop spammers, or make Exchange a little bit stronger for defending itself for this endless spam war.
Receiving blank messages or spam makes a business valuable time and resources waste, and top of that we have to deal with angry managers and unhappy users.
I have decided to put some notes together for those who need some guides in order to achieve my goal of making Exchange a little bit more secure and strong.
Goals and Objectives
1. Use antivirus and spam software with your exchange, I am little bias and like Trend Micro in this matter, Trend is doing great job, if you are corporate than you may want to implement hardware solution, Iron port, Barracuda, end etc.
2. Use IMF Microsoft Intelligent Message Filter, it is FREE (-:
3. Enable Sender filtering (follow reading this article I will illustrate this)
4. Enable Filter messages with blank senders
5. Enable Drop connection if address matches filter
6. Add your own domain (whole domain into Block list) I know this will sound weird, make sure you do not have application within your network, this might break some of the applications which is relaying exchange to send inbound or outbound e-mails
7. Enable Recipient filtering
8. Enable Filter recipients who are not in the Directory
9. Add regularly spammers either Whole domain (@smapmer.com) or single e-mail address
(firstname.lastname@example.org) into block list
10. Enable SMTP Tar pitting
Ben Winzenz explains
A Collection of Random Thoughts
Microsoft SMTP tar pit feature for Microsoft Windows Server 2003
Henrik Walter with simple plain style, one of my favorite