MailScanner Installation and Configuration: Part Two

MailScannerIn the previous article, we introduced MailScanner and covered installation as well as basic configuration. In this article, we will look at some of the other configuration options.

If we navigate to Services -> MailScanner, there are nine tabs. The second tab is “Attachments“. Under the “Attachments” heading, there are several settings. The “Attachments features” list box controls how attachments are handled. “Expand TNEF” causes MailScanner to expand TNEF (Transport Neutral Encapsulation Format) attachments. TNEF is a proprietary e-mail attachment format used by Microsoft Outlook and Microsoft Exchange Server. “Deliver Unparsable TNEF” will do the opposite, and leave TNEF attachments unexpanded. “Find Archive By Content” will enable searching archives. “Unpack Microsoft Documents” will expand non-TNEF Microsoft attachments, and “Zip Attachments” will allow zip attachments through.

TNEF Contents” specifies what to do when TNEF attachments are expanded. If this is set to “no”, a TNEF attachment will be listed as an attachment, but not the attachments contained therein. If however, this is set to “add” or “replace”, then the attachments contained in the archive will be added to the list of attachments in the message, and recipients of messages sent in this format will be able to read the attachments even if they are not using Microsoft Outlook.

Maximum Attachment Size” specifies the maximum size (in bytes) of any attachment in a message. If this is set to zero, no attachments will be allowed. If this is set to less than zero, then no size checking will be done. The default value is -1.

Scrolling down, you will see edit boxes containing two separate config files: filename.rules.conf and filetypes.rules.conf. filename.rules.conf allows or denies certain files based on the file’s extension, while filetypes.rules.conf allows or denies certain file types based on their MIME (Multipurpose Internet Mail Extensions) type.

The next tab is “Antivirus“. under the “Antivirus” heading, there are several settings. The first is “Virus scanner features“. “Virus Scanning” is enabled by default, as is “Check Filenames In Password-Protected Archives“. In addition, you can enable such features as “Deliver Disinfected Files” (deliver files after they have been disinfected by the antivirus engine), “Still Deliver Silent Viruses“, “Block Encrypted Messages“, “Block Unencrypted Messages“, and “Allow Password Protected Archives“. The next setting is “Virus scanner“, which controls which virus scanner to use. Possible settings are “auto” (let MailScanner decide what to use), “clamav” (Clam AV), “clamd” (the Clam daemon), or “none” for no e-mail scanning. “Virus Scanner Timeout” controls the maximum length of time the commercial virus scanner is allowed to run for one batch of messages. The default is 300 seconds. The next heading, “Custom antivirus options“, allows you to add any custom parameters you need to specify.

The next tab is “Content“. The first heading is “Removing/Logging dangerous or potentially offensive content“. The first setting is the “Contents” list box, which determines what content for which MailScanner will scan. The default settings are “Dangerous content Scanning“, “Find Phishing Fraud“, “Also Find Numeric Phishing“, “Use stricter Phishing Net“, and “Highlight Phishing Fraud“. Other settings include “Allow Partial Messages“, “Allow External Message Bodies“, “Convert Dangerous HTML To Text“, “Convert HTML To Text“.

External Links:

The official MailScanner web site
MailScanner at Wikipedia

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