Sunday, July 29, 2007

Exchange Server - Spam Solution

In modern era , 75% mail servers were affected by the automated unsolicited Email called Spams. Controlling the amount of spam hitting your organization is more critical and more importantly we also need to prevent your domain name from listing in the spam database. we have several anti spam application and appliances to minimize the chance of keeping spams away from your mailbox. The major technology behind this anti spam solution is Bayesian analysis. what is Bayesian analysis? .To make it simple it is a analyzing the whole message using a probabilistic approach.

Metrics for Bayesian analysis:
Prob(spam|words)=( Prob(words|spam) X Prob(spam) ) | prob(words)

Exchange Server:
Exchange server tops the chart in the email server solution among the different technology like Lotus Notes,send mail,Q mail,post fix and many others. I am going to discuss about the spam solution in terms of the exchange server alone. Exchange server product come along with the anti spam solution called IMF(Intelligent message filter). But the solution is 50 out of 100 hence forth we should relay on some anti spam solution product until Microsoft produce some effective add-on solution with the exchange server product itself.
It is better to have anti spam application rather than the appliances.Due to the scalability and manageability reason,server side spam control is obvious.With the multitude of antispam solution for exchange,choosing the right product is not a simple task.Factors to be reviewed while selecting the antispam product to your network is important. Features like Bayesian analysis support, new spam signatures,keyword checking,header checking,SPF(Sender Policy Framework) support,DHA(Directory harvest attack),CCS(Central Checksum Service) bulk email detection,automated whitelist,blacklist,customizable policy for individuals/groups,foreign language spam,Anti-phishing,remote management,email alerts,character set blocking,image spam filter,Log reporting ,disclaimers and signatures.

List of antispam solution:
GFiMailEssentails for Exchange/SMTP
Exclaimer mail utility for exchange server
Surf Control for exchange server
XWall for exchange server
Symantec Mail Security for Exchange
Sybari Advanced Spam Manager
MIMEsweeper Spamlogic anti-spam appliance
Lyris MailShield
Kaspersky Security
McAfee SpamKiller
Sophos PureMessage
ORF antispam

Above listed antispam solution will do address your spam issue.
Please do post, if you have any queries.

thanks
Logu

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