spam and viruses can be defeated simply by deploying MailScanner. systems, this first version of the MailScanner Manual includes only installation. MailScanner Guide. Contents. Acknowledgements; Brief Description; Features and Highlights; How It Works; Presentation given at JANET NetWorkshop Abstract. A guide to installing and using MailScanner, and a complete training manual describing its operation and use in fine detail.

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Normally, SpamAssassin skips over all non-text attachments and does not scan them for indications that the message is spam.

MailScanner Installation Guide –

mailxcanner All of the keywords available in the “forward” action also work here. There is no way to guarantee that the file fetched by the user’s email package is free from viruses, as MailScanner never sees it.

If you don’t understand this, the answer is probably “no”. The rules are matched in order from the top to the bottom of the file, and the first rule containing a matching regular expression is used. The worst possibility is that there is a very small mailsfanner of a few messages being mmailscanner twice, but this has not been reported in practice.

Once the size limit is reached, MailScanner continues adding to the data passed to SpamAssassin, until at most the 2nd number msilscanner bytes have been added looking for a blank line.

Setting it to no means that it will be treated as “normal” spam. File permissions are also checked and set on the appropriate directories.

If your queue is bigger than this size a lot of the time, then some messages could be greatly delayed. It is used in the Help Desk note contained in the virus warnings sent to users.

MailScanner: A User Guide And Training Manual

I must also thank Nick Philips mailsxanner all his contributions and tireless work on the Exim support. A few viruses store their infected data in UU-encoded files, to try to catch out virus scanners.


To use a different configuration file, specify it on the MailScanner command line. It is very mailscaner to set this to 1 as it removes any zero-length attachments which may be created by broken viruses. It does slightly slow down the startup of MailScanner, of course, but that is only done once and so it does not really matter. Disable this option by setting it to a huge value. This is the text to add to the start of the majlscanner if the “Filename Modify Subject” option is set.

Once you have deployed this into “production” use, you should set Note: Do you want to include the “Spam Score” header.

The result is that while an attachment called ” Your Document. If you specify “auto” then MailScanner will search for all the scanners you have installed and will use all of them.

This makes it very easy for users to be able to filter their mail using whatever SpamAssassin threshold they want. A good example of this is a document macro virus or a Joke program.

MailScanner Configuration Index

This is the text to add to the start of the subject if the “Phishing Modify Subhect” option is set. Do you want to check watermarks? Some email systems, if bouncing a message between 2 addresses repeatedly, add information about each bounce as an attachment, creating a message with thousands of attachments in just a few jailscanner.

Enable this feature if you have more then one Mailscanner installation or you have a trust relationship with another Mailscanner user. Log all the filenames that are allowed by the Filename Rules, or just the filenames that are denied?

By replacing it with a real image, the page layout still works properly, so the formatting and layout of the message is correct. See the file itself for more information. Otherwise it will ignore all your current rules! Leaving this set to “no” is a good way of protecting against all the protected zip files used by viruses at the moment.

Do you want to deliver messages once they have been cleaned of any viruses?

Configuration Index – MailScanner v5.1.x

Guid it is set to “delete”, then the message is deleted and no further action is taken. Location and full command of the “antiword” program Using a ruleset here, you could have different output styles for different people. Good to make sure this is customised for your site, as you don’t want to be reading other people’s watermarks.


You probably want to set this to 2 if you are actually using this feature. When using MailScanner, this is split into two separate jobs, each handled by a different sendmail process and a different queue. If it takes more seconds than this, then it should be considered to have crashed and should be killed.

Very useful if you use several virus scanners, but a bad idea if you don’t want to let your customers know which scanners you use. Except it mailscaner not the real bank’s web site at all, it is a very good copy of it run by thieves who want to steal your personal information or credit card details. If enabled; this will log lots of debugging output to STDERR and to syslog guidw help pinpoint any errors in the returned database values and will show exactly what is being processed as the data is mailscaanner loaded.

This is the syslog “socket type” that MailScanner uses. It will still start up, regardless, but it will print plenty of errors and warnings if anything important is wrong in your setup, instead of just logging it to your system’s mail logs. Deny any attachment filenames matching any of the patterns listed here. Do the spam checks first, or the MCP checks first? If this is set to zero, then no size checking is done.

Should unencrypted messages be blocked? The maximum length of time the “file” command is allowed to run for 1 batch of messages in seconds.