Editing Apache SpamAssassin (section)

==Methods of usage==
Apache SpamAssassin is a [[Perl]]-based application ({{mono|Mail::SpamAssassin}} in [[CPAN]]) which is usually used to filter all incoming mail for one or several users. It can be run as a [[Computer process|standalone application]] or as a subprogram of another application (such as a [[Milter]], [[SA-Exim]], [[Exiscan]], [[MailScanner]], [[MIMEDefang]], [[Amavis]]) or as a [[client (computing)|client]] ({{mono|spamc}}) that communicates with a [[daemon (computer software)|daemon]] ({{mono|spamd}}). The client/server or embedded mode of operation has performance benefits, but under certain circumstances may introduce additional security risks.

Typically either variant of the application is set up in a generic [[mail filter]] program, or it is called directly from a [[mail user agent]] that supports this, whenever new mail arrives. Mail filter programs such as [[procmail]] can be made to [[pipe (computing)|pipe]] all incoming mail through Apache SpamAssassin with an adjustment to a user's {{mono|procmailrc}} file.