Spamassassin files

Important note -- this does NOT include the IP address from the most recent 'untrusted line', as used in '-firsttrusted' above. That's because we're talking about the trustworthiness of the IP address data, not the source header line, here; and in the case of the most recent header the 'firsttrusted' , that data can be trusted. Note: the set name must be exactly the same for as the main query rule, including selections like '-notfirsthop' appearing at the end of the set name.

The 'body' in this case is the textual parts of the message body; any non-text MIME parts are stripped, and the message decoded from Quoted-Printable or Baseencoded format if necessary. The message Subject header is considered part of the body and becomes the first paragraph when running the rules. All HTML tags and line breaks will be removed before matching. The 'uri' in this case is a list of all the URIs in the body of the email, and the test will be run on each and every one of those URIs, adjusting the score if a match is found.

The 'raw body' of a message is the raw data inside all textual parts. The text will be decoded from base64 or quoted-printable encoding, but HTML tags and line breaks will still be present. The pattern will be applied line-by-line. The full message is the pristine message headers plus the pristine message body, including all MIME data such as images, other attachments, MIME boundaries, etc. Note that Perl builtins and functions, like abs , can't be used, and will be treated as rule names.

SpamAssassin will ignore these for scoring. However, all settings can be used by local programs run directly by the user. These tests are only run as part of the test suite - they should not affect the general running of SpamAssassin. For system-wide SpamAssassin use, you may want to reduce disk space usage by sharing this across all users. However, Bayes appears to be more effective with individual user databases. Make sure you specify this using the 'x' mode bits set, as it may also be used to create directories.

However, if a file is created, the resulting file will not have any execute bits set the umask is set to NOTE: By default the user is considered invalid until a plugin returns a true value. If you enable this, but do not have a proper plugin loaded, all users will turn up as invalid.

You have to write the DSN as an LDAP URL, the components being the host and port to connect to, the base DN for the seasrch, the scope of the search base, one or sub , the single attribute being the multivalued attribute used to hold the configuration data space separated pairs of key and value, just as in a file and finally the filter being the expression used to filter out the wanted username.

This will be replaced with the username. Here are several example queries, please note that these are broken up for easy reading, in your config it should be one continuous line. If it is omitted, the module will be loaded using perl's search path the INC array. The conditional accepts a limited subset of perl for security -- just enough to perform basic arithmetic comparisons.

The following input is accepted:. If the end of a configuration file is reached while still inside a if scope, a warning will be issued, but parsing will restart on the next file. Note: The version used is in the internal SpamAssassin version format which is x. SpamAssassin rules can be defined by the administrator and by the user if certain conditions are met.

SpamAssassin's power is evident when the individual scores are summed—the final score is worth much more than the individual scores themselves. After SpamAssassin has "scored" a message, the tool can do a number of things:. Arguably the most useful function in SpamAssassin is the act of scoring the message and adding an appropriate header indicating the score. Adding a score enables email clients such as Outlook, Mozilla Messenger, etc.

However, setting up and training end users takes considerable time and effort from the administrator. Our coverage of SpamAssassin is designed for Unix-based systems. This web page covers the largely manual process for making SpamAssassin work on MS Windows platforms. SpamAssassin can be set up to work at mail delivery time when mail is being written to the users' mailbox, often called "per-user" or transfer time when mail is coming into the system.

Both are useful in the fight against spam, although normally the administrator picks one approach per system. Per-user checking is good for a small number of users and for working out bugs. Figure 3. When you are happy with the per-user installation, you can roll the setup system-wide and implement SpamAssassin for all user accounts at mail transfer time.

SpamAssassin documentation refers to this mode as "site-wide", but that is a bit of a misnomer, which is why this book will use the term interchangeably with "system-wide". The box labeled MTA interface in Figure 3. Before we get to the actual installation of SpamAssassin, it is useful to cover how to integrate it into your environment. These programs enable a number of actions on messages, including anti-virus, filtering, and, of course, anti-spam.

The other way to integrate SpamAssassin into your email system is to use a facility such as Procmail, which can be enabled on a per-user basis. Using Procmail might be good for initial testing or for use on a small site. Although this approach will certainly work, the per-user procmail method requires more work on the administrator's part.

Any site with more than a handful of users is probably going to want to use a site-wide method. In the case of Sendmail, there is a standard facility called Sendmail Mail Filter or milter , which allows administrators to call programs to perform desired functions including filtering and spam detection , which are not part of Sendmail itself. With Postfix, the options are more varied. We chose to use amavisd-new as our Postfix integration method. Regarding qmail, the options are fewer.

We chose the Qmail-Scanner software as our integration. As with other MTAs utilizing Procmail for individual users, qmail's. This would be good for a small organization, but larger sites will want to use something like Qmail-Scanner.

Table summarizes what we use in this chapter for implementing SpamAssassin from each MTA and where to get more information. If it keeps reporting some messages wrong, you can script some whitelist method to ignore certain files etc. Evaluate Confluence today. Pages Blog. Child pages. Browse pages. A t tachments 0 Page History People who can view. Copy Page Tree. Jira links. Cleaning a Mail Corpus Here's a few methods used to deal with common forms of corpus pollution — messages in a mail corpus that aren't suitable for use in a MassCheck.

It may not be solely classified using automated spam-classification algorithms such as SpamAssassin and other spam filters; we need the human decision although it may be aided by SpamAssassin , of course. Also, we can't use data that's been collected from third-party accounts, since we don't know what the recipient may have signed up for.

Reliable source : Ensure that the mails were classified by a trustworthy source; mails marked as spam by users at your ISP, for example, are not reliable enough for use as a SpamAssassin corpus.

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