Fighting Spam in an ISP Environment

White Paper: ISP Anti-Spam Best Practices
White Paper
Fighting Spam in an ISP Environment:
Challenges, Solutions and Best Practices
April, 2005
Summary
An ISP presents one of the most complex environments for managing spam due to thevolume of e-mail, wide variety of users and high level of service demanded bycustomers. This white paper reviews the most common approaches to spammanagement in an ISP environment and details how a suitable solution must addressparticular challenges for ISP administrators.
The paper provides comprehensive best-practices for spam management in an ISPenvironment, including guidelines for evaluation, roll out and deployment of an anti-spam solution. Roaring Penguin has developed these best practices through extensivework with ISPs in resolving their spam challenges, and has developed the CanIt-PROanti-spam solution in conjunction with ISPs across North America.
Copyright © 2005, Roaring Penguin Software Inc.1White Paper: ISP Anti-Spam Best Practices
The Challenge of Spam for ISPs
The challenge to solve the problems of spam e-mail is reaching the desks of ISP CTOsacross North America and Europe. A combination of factors has elevated the urgencyfor better management of spam, including:
.Pressure from end-users and the ensuing tax on help-desk staff indealing with spam-related complaints..The need to protect networks and end users from malicious threatscarried via e-mail..The increasing collusion of commercial spam with fraud schemes,phishing attempts and malicious viruses..A desire for tools that help ISPs protect customers from unwanted e-mail.
However, ISPs present one of the most complex environments for managing spam dueto the volume of e-mail, wide variety of users and high level of service demanded bycustomers. This white paper reviews the most common approaches to spammanagement for ISPs and details how a suitable solution, such as Roaring PenguinTMSoftware's CanIt-PRO , must address particular challenges for ISP administrators.
The paper concludes with comprehensive best practices for spam management for ISPs.It includes guidelines for evaluation, roll out and deployment of an anti-spam solution.Roaring Penguin has developed these best practices through extensive work with ISPsin resolving their spam challenges.
Common ISP Solutions to SpamISPs generally consider three types of anti-spam solutions:
.Outsourced filtering services relay your mail through a third partysystem housed off site. These systems can sometimes be too costly forthe typical ISP budget. These can also present concerns about a loss ofcontrol or security over ISP e-mail..Home grown solutions are typically based on open-source softwareTMsuch as SpamAssassin and Roaring Penguin's MIMEDefang. In mostcases, these solutions were sufficient until about 2002, when the volumeof spam and spammer's ever-evolving techniques began to render home-grown solutions unmanageable..Third-party in-house solutions offer a balance point between theabove two options. While benefiting from the experience of a third partyprovider you keep the flow of your email traffic on your own network.A solution that deals with spam at the mail server is preferable for ISPs. Such a solutionis centrally manageable and deals with the problem before spam and viruses reachend-users or consume network resources.
Copyright © 2005, Roaring Penguin Software Inc.2White Paper: ISP Anti-Spam Best Practices
Getting Anti-Spam Right at an ISPThe main challenge for an ISP looking for an anti-spam solution is to find a product forthe server that also provides the flexibility most ISPs need to suit their wide variety ofusers and those users' preferences. For example, ISPs would be unable to globallydefine that messages that look like newsletters or product information are spam, assome users may have legitimately requested to receive this information. In additionsome ISPs do not want to be thought of as censoring the content that their users areaccessing, unless explicitly asked to do so.
Other key requirements for an effective ISP anti-spam solution typically include:
.Ability for administrators to set global policies, in particular asregards the filtering of viruses and certain types or sizes of mailattachments..Ability to let end-users make the final decision about what is or is notspam - or even to opt out of spam filtering all together... [download for more]