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With SpamAssassin, you can filter sent and received email for spam The filter examines both headers and content, drawing on rules designed to detect common spam messages When they are detected, it then tags the message as spam, so that a mail client can then discard it SpamAssassin will also report spam messages to spam detection databases The version of SpamAssassin distributed for Linux is the open source version developed by the Apache project, located at spamassassinapacheorg There you can find detailed documentation, FAQs, mailing lists, and even a listing of the tests that SpamAssassin performs SpamAssassin rule files are located at /usr/share/spamassassin The files contain rules for running tests such as detecting the fake hello in the header Configuration files for SpamAssassin are located at /etc/mail/spamassassin The localcf file lists systemwide SpamAssassin options such as how to rewrite headers The initpre file holds spam system configurations The spamassassin-spamcrc file will redirect all mail to the spamc client Users can set their own SpamAssassin options in their spamassassin/user_prefs file Common options include required_scorei, which sets a threshold for classifying a message as SPAM, numerous whitelist and blacklist options that accept and reject messages from certain users and domains, and tagging options that either rewrite or just add SPAM labels Check the Mail::SpamAssassin::Conf Man page for details To configure procmail to use SpamAssassin, you need to have procmail run the /etc/ mail/spamassassin/spamassassin-spamcrc file This will filter all mail through SpamAssassin The spamassassin-spamcrc file uses the spamd daemon, which means you have to have the SpamAssassin service running The spamassassin-defaultrc file runs a less efficient script to use SpamAssassin, instead of the daemon If you want systemwide procmail filtering, you use the /etc/procmailrc file; whereas to implement filtering on
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a per-user basis, you use a procmail file in the user s home directory Within the respective procmail files, add the following at the top:
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INCLUDERC=/etc/mail/spamassassin/spamassassin-spamcrc
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Configuring Postfix for use with SpamAssassin can be complicated A helpful tool for this task is amavisd-new, an interface between a mail transport agent like Sendmail or Postfix and content checkers like SpamAssassin and virus checkers Check ijssi/software/ amavisd for more details
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PART VI
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CHAPTER
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Print, News, Search, and Database Servers
rint servers have become an integrated part of every Linux system They allow you to use any printer on your system or network Newsgroup severs are more rare, used for setting up newsgroups for local networks or for supporting the Internet s Usenet News service Database servers are becoming more common for managing large collections of data on local networks, as well as for Internet services
Printer Servers: CUPS
Once treated as devices attached to a system directly, printers are now treated as network resources managed by print servers In the case of a single printer attached directly to a system, the networking features becomes transparent and the printer appears as just one more device On the other hand, you could easily use a print server s networking capability to let several systems use the same printer Although printer installation is almost automatic on most Linux distributions, it helps to understand the underlying process Printing sites and resources are listed in Table 26-1 The Common Unix Printing System (CUPS) provides printing services It is freely available under the GNU Public License Though it is now included with most distributions, you can also download the most recent source-code version of CUPS from cupsorg, which provides detailed documentation on installing and managing printers CUPS is based on the Internet Printing Protocol (IPP), which was designed to establish a printing standard for the Internet (for more information, see pwgorg/ipp) Whereas the older line printer (LPD) based printing systems focused primarily on line printers, an IPP-based system provides networking, PostScript, and web support CUPS works like an Internet server and employs a configuration setup much like that of the Apache web server Its network support lets clients directly access printers on remote servers, without having to configure the printers themselves Configuration needs to be maintained only on the print servers CUPS is the primary print server for most Linux distributions With libgnomecups, GNOME now provides integrated support for CUPS, allowing GNOME-based applications to directly access CUPS printers
Part VI:
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