Roaring Penguin Adds Granularity to the CanIt Reputation List

Roaring Penguin Software upgrades their CanIt IP Reputation list. The CanIt IP Reputation list is a key component of the CanIt family of anti-spam solutions for ISPs, Web Hosts, Universities, and Managed Services Providers.

Ottawa, ON -- (SBWire) -- 02/09/2011 -- Roaring Penguin Software's CanIt Reputation List collects IP reputation data on e-mail servers fr1om a worldwide network of sensors. Roaring Penguin currently aggregates this data into four DNS-based block lists:

Spam Source: A list of IP addresses that have sent mostly spam and very little non-spam.

Dictionary Attackers: A list of IP addresses that have sent to many nonexistent recipients and very few valid recipients.

Greylist Stumblers: A list of IP addresses that have been thwarted by greylisting. Such machines are typically compromised personal computers.

Good: A list of IP addresses that have passed greylisting, have sent to very few nonexistent recipients, and have sent mostly non-spam. These machines are very likely legitimate mail servers.

To these block lists Roaring Penguin has added a new list called "Mixed" for hosts that send a mixture of spam and non-spam.

Roaring Penguin found that the old "SpamSource" list would often list outbound mail servers for large e?mail providers. These servers tend to send a lot of spam, but they also send a lot of non-spam e-mail.

The change to Roaring Penguin's Reputation Lists means that about 5600 machines formerly listed on the "SpamSource" list are now listed on "Mixed". This still leaves almost 1.9 million machines listed on the "SpamSource" e-mail reputation list.

CanIt 8.0 is available as:

CanIt-PRO, an anti-spam / anti-virus appliance or a soft appliance.
CanIt-Domain-PRO, spam filtering software that allows service providers such as MSPs to host anti-spam for their customers.
Hosted CanIt, a fully outsourced anti-spam solution.

About Roaring Penguin
Founded in 1999, Roaring Penguin Software Inc., specializes in developing spam email blockers The company focuses on fighting spam at the mail server, with the acclaimed CanIt and MIMEDefang product lines. Today, Roaring Penguin develops, deploys and supports its spam- and virus-fighting software for customers that include enterprises, ISPs, campuses, web hosts, and government offices. For more information, visit

Media Relations Contact

Bill White
Roaring Penguin Software

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