Sender Score aggregates data from 60 million mailboxes at a variety of ISPs, spam filtering and security companies. This suite of tools provides a deep view of the direct measures of a sender's behavior and the impact those behaviors have on Email recipients and the sender's brand and email deliverability.
They are somewhat effective in preventing spam, particularly if you pay them anywhere between $1400 - $21500 to be a member of their network.
According to the Senderscore.org website, this service is being used by a number of large ISPs and communication networks, including "Hotmail/MSN, Road Runner, Cox, SpamAssassin, and IronPort C-Series" to combat SPAM.
The problem is that in order to improve your score in a timely manner you need to pay them anywhere from $1400 - $21,500 to get an improved score. They provide no way to contact them or request an evaluation for scoring.
Cons
First and foremost I'd like to state that the SenderScore.org reputation scoring system is running an extortion pay for play scheme and is NOT recommended. I strongly recommend using firewall systems that use Senderbase.org for reputation spam prevention calculations as this system seems to accurately reflect real-time activity in a fair way.
Our mail server had one incident where a user allowed their email account to be accessed by a spammer. The problem was resolved within 24 hours. Over the past 45-days there have been zero incidents. Senderscore's own graph shows continuous lower than average activity with no spikes in increased activity and still continues to fluctuate our reputation score lowering it without cause or justification and continues to rate our server as "very high volume sender".
Senderscore is an anti-spam reputation scoring system with a non-profit .org domain despite engaging in extortionist pay for play schemes.
Summary
According to the Senderscore.org website, this service is being used by a number of large ISPs and communication networks, including "Hotmail/MSN, Road Runner, Cox, SpamAssassin, and IronPort C-Series" to combat SPAM.
The problem is that in order to improve your score in a timely manner you need to pay them anywhere from $1400 - $21,500 to get an improved score. They provide no way to contact them or request an evaluation for scoring.