Here is a case study of a realtor eliminating 95% of its spam.
Using Postini Perimeter Manager, APR hasbeen able to:
• Eliminate more than 95 percent of spam messages were blocked before they reached APR’s network, reducing the volume of incoming email traffic by nearly 75 percent (more than 30,000 messages a day), freeing agents to concentrate on their sales activities.
• Avoid the planned purchase of additional servers to handle growing spam traffic. Gain a significant reduction in the labor required to manage its email system, saving the IT Director from having to dedicate a full time position to email administration.
This company Postini was acquired by Google a year ago.
If you are looking for your own solution to reduce spam another company to look at besides Postini is http://mailchannels.com/ product Traffic Control.
MailChannels Traffic Control provides innovative email traffic shaping solutions for organizations of all sizes, enabling customers to simultaneously solve their spam problems and reduce their email infrastructure costs.
Traffic Control takes a new approach to stopping spam. It evaluates the sender of the email instead of the content, and slows down any suspicious email. Legitimate email is let through right away but during the slow-down, spam often gives up and filters have more time to react.
MailChannels customers are much better equipped to deal with increasing volume and severity of spam attacks. With our patented SMTP multiplexing technology, organizations of all sizes are protected at a fraction of the cost of the problems caused by spam over-sized infrastructure, help desk and related costs, and reduced productivity.
Here is mailchannels case study.
Before adopting the MailChannels solution, he considered and rejected several different options to solving his problem including:
Buying more servers with higher CPU power
Using an outsourced service such as Postini or MessageLabs
Installing a dedicated email appliance or appliance cluster