Here is an article I found on SearchSecurity.com (TechTarget), about how to prevent spam bots from hijacking an enterprise network. I think you will find it interesting and useful:

"Despite Bill Gates' assertion in 2004 that the problem of spam would be solved by now, it's still with us. In fact, it's on the increase. According to recent figures from Symantec, 61% of emails are spam, and almost 90% of emails emanating from some countries are spam.

Gecad Technologies, the company developing the AXIGEN Mail Server, announced this month the first round of investments from a consortium of important venture capitals and technology companies such as Global Finance, 3TS-Cisco Growth Fund III and others. The investment amounted to 2 million euro and is equivalent to 11.76% of the Gecad Technologies/AXIGEN shares.

And here is the full news for those who want to know about it, lxer.com/module/newswire/view/95996/index.html

The eMail Event covers every aspect of using, managing and monitoring inbound and outbound email. The target audience comprises a mix of senior Technologists & Marketing Professionals, who have come to rely on email (and related technologies) as a business-critical method of communication.

The event format includes an extensive range of industry seminars and workshops, to which all delegates have free access. Now in its 3rd successful year, we have confirmed the need for an event dedicated to email management and established Inbox/Outbox as Europe’s Leading Email Event.

Date and location:
17th & 18th Jun, 2008
New Connaught Rooms, London, UK

Additional details are available here: http://www.inbox-outbox.com/