Install Guide Installation Overview Installing MailScanner is as easy as downloading an installation package, extracting the contents, and running the included install. Depending on which operating system specific package you select, you will be presented with different installation options that have been tailored to that operating system. However, the most common and easily supported operating systems that have specific packages and testing are listed to your right. Getting Started For server level systems such as email gateways, which is what MailScanner is, you really should not install a GUI with your operating system unless it is specifically designed for use with MailScanner such as Mailborder or Baruwa.
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It is used at over 30, sites around the world, protecting top government departments, commercial corporations and educational institutions. This technology is fast becoming the standard email solution at many ISP sites for virus protection and spam filtering. MailScanner scans all e-mail for viruses, spam and attacks against security vulnerabilities and plays a major part in the security of a network. To securely perform this role, it must be reliable and trustworthy.
The only way to achieve the required level of trust is to be open source, an approach the commercial suppliers are not willing to take.
By virtue of being open source, the technology in MailScanner has been reviewed many times over by some of the best and brightest in the field of computer security, from around the world. How MailScanner Works MailScanner provides the engine used to scan incoming emails, detecting security attacks, viruses and spam. Email is accepted and delivered to an incoming queue directory. When messages are waiting in the incoming spool directory, MailScanner processes the waiting messages and then delivers the cleaned messages to the outgoing queue directory where they are picked up and delivered normally.
Only after the messages are delivered to the outgoing queue directory are they deleted from the incoming spool directory. This ensures that no mail is lost, even in the event of unexpected power loss, as the system always has an internal copy of all messages being processed.
The first MTA instance is started in daemon mode to accept incoming email. Email is accepted and simply delivered to an incoming queue directory. The second MTA instance is also started in daemon mode and watches an outgoing queue directory for scanned and processed messages that need to be delivered. To accomplish these scanning and processing tasks, MailScanner starts a configurable number of MailScanner child processes.
Typically there are five child processes which examine the incoming queue at five second intervals and select a number of the oldest messages in the queue for batch processing. If the message passes the MailScanner RBL tests it is passed to SpamAssassin which uses heuristic, Bayesian and other tests to determine the spam level of the message see Figure 1.
SpamAssassin actually assigns a numerical value to each test that is used on the message. SpamAssassin also examines the site specific white lists not spam and black lists is spam.
If the sender, system or domain of the message sender is on either list, a very high black list , or a very low negative score is assigned to the message. SpamAssassin calculates the final spam score for each message at the end of these tests. MailScanner may be configured to use one or more of seventeen commercial or open source virus scanners. MailScanner may be configured to scan for viruses inside of zip files. If a virus is detected at this point, the message is marked as containing a virus.
Once virus detection is complete, the MailScanner child process examines the filename and file types of any email attachments against site configurable rule sets. Virtually any type or name of attachments can be blocked or passed depending on how MailScanner has been configured.
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