Installation Instructions
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Copy spamassassin_wrapper.py to a desired directory and make sure that it is executable by the user you choose to run your spamassassin process. ('spamuser' in this particular example)


Running
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1) Open $POSTFIX_HOME/master.cf

2) Edit the following line:
smtp      inet  n       -       n       -       -       smtpd
to:
smtp      inet  n       -       -       -       -       smtpd -o content_filter=spamassassin

3) Add the 'spamassassin' filter in the bottom of the file:
spamassassin unix -         n     n     -       -             pipe
	   flags=Rq user=spamuser argv=/path1/spamassassin_wrapper.py --pipe /path2/spamassassin --pipe /path3/sendmail -oi -f ${sender} ${recipient}


where:
path1 - the full path to the spamassassin_wrapper.py
path2 - the full path to the spamassassin executable
path3 - the full path to **Postfix'** sendmail

You can provide additional / other parameters to spamassassin, sendmail and spamassassin_wrapper.py.
Consult the man pages for more details. (Use 'spamassassin_wrapper.py -h' to display the full parameter list for spamassassin_wrapper itself)

Additional information:
http://wiki.apache.org/spamassassin/IntegratedSpamdInPostfix