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Product Specification
ORF Enterprise Edition
ORF is a high-performance spam filtering extension for Microsoft® IIS SMTP Service and Microsoft® Exchange 2000/2003 servers.
How does it work?
ORF employs multiple filtering technologies, such as DNS blacklists, SURBL checks, greylisting, keyword and attachment filtering to identify spam and other kind of unwanted emails.
The ORF SMTP Module builds into the SMTP conversations and monitors specific events to perform filtering. The unique dual filtering model allows protocol-level protection, which saves storage and bandwidth.
Highlights
This is a brief introduction of the features and capabilities provided by ORF Enterprise Edition. For a more complete list of features, please visit the Features section.
Dual filtering model
ORF works on SMTP transport level. This allows filtering emails before they would be actually sent by the sender server (Before Arrival Filtering). Filtering on email arrival is also supported by ORF.
Always up-to-date software: DNS blacklists and SURBL's
ORF's most effective spam filtering feature is the ability to use DNS blacklist and SURBL's. These are online databases of various spam characteristics.
Most of these blacklists, like SpamCop or DSBL are updated almost every second which guarantees that ORF can block the latest spam attacks.
Attachment filtering
The flexible attachment filtering options provided by ORF allow you to drop emails with specific attachment types or to replace the attachments with a customisable warning text.
Custom tests: Keyword filtering, Greylisting, Reverse DNS, FQDN test, etc.
For the most effective filtering ORF also offers custom tests in addition to the above, such as greylisting, powerful keyword filtering with regular expression support or the reverse DNS (RDNS) test.
Reject emails sent to non-existent recipients
Unlike other mail servers, Exchange 2000 does not reject emails addressed to local recipients that does not exist. Exchange 2000 accepts the email for delivery and bounces the email later if the recipient user does not exist. Spam is often sent with fake sender email address that does not exist to recipients that are no longer valid, which results in tons of NDR's filling up the mail queue.
Using the ORF's Active Directory integration you can reject incoming emails addressed to local mailboxes that are no longer (or never been) valid.
Outstanding performance
Due to its design and the filtering technologies used, ORF can filter millions of emails a day on an average server hardware. It is being used in networks with a daily average of 2-3 millions incoming mail without any performance problems.
Unlike many other software, ORF does not run as a mail relay server, instead it integrates with the high-performance Microsoft® IIS SMTP Service (also used by Microsoft® Exchange 2000/2003).
General email filtering tools
Using ORF you can create your own IP address, sender and recipient email address lists. While the whitelists can be used to exclude hosts, senders or local mailboxes from filtering, the same type of blacklists help you reject messages from specific hosts or IP ranges, senders (domains) or local mailboxes.
Monitoring ORF
ORF produces detailed, customisable logs about the incoming emails that can be viewed by a built-in log viewer. Real-time statistics are also available.
System requirements
Microsoft® Windows® 2000/2003
Microsoft® IIS SMTP Service (IIS 5 or 6) or Microsoft® Exchange 2000 or 2003
Microsoft® Internet Explorer® 6 or later
6Mb (megabytes) of hard disk space for program and help files
Administrator privileges to install and configure
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