What benefits does Orf 5.1 have over Exchange 2010's builtin spam filter? - ORF Forums

@jean.davis: well, if the built-in spam filtering features of Exchange had been sufficient in the ongoing battle against spam, we would have gone out of business a long time ago :) Exchange is a mail server software: it has some really nice anti-spam features, but spam filtering has never been its primary function. On the other hand, ORF was designed to filter spam, and it does the job exceptionally well. Though there is some overlap in the functionality of ORF and the anti-spam features of Exchange, it offers many additional tests (e.g., Exchange lacks SURBL functionality if I'm not mistaken) and/or simply does them better.

For example, the spam filtering of Exchange is triggered at the End of DATA (EOD) phase of the SMTP transport, while ORF can run most of its test before the email has arrived (Before Arrival filtering). This takes a significant load off your server. Its logs are easy to read and filter using the Log Viewer tool, so you can find out what happened to an email within a matter of seconds. Setting up rules and maintaining its configuration is way easier using the Administration Tool, compared to the configuration of Exchange anti-spam rules.

Exchange works with probability scores (SCL) and thresholds, while ORF makes a clear decision whether an incoming email is spam or not. False positives are a non-issue, thanks to the Auto Sender Whitelist functionality. If configured properly (as per described in our Best Practices Guide: http://vamsoft.com/r?o-best-practices), it can catch 94-99% of spam with zero false positives and with a very low maintenance overhead.

For a more detailed technical overview, please visit

http://vamsoft.com/features

If you have any questions regarding a feature in particular, I am at your service.