[SAtalk] Meaning of spamassassin -a option

[John Parken]

Through the news.spamassassin.org site I found what looks like a good way for Outlook users to get spam (and ham) into the Bayes sa-learn.  Dan Kohn suggestions is at ─ http://www.dankohn.com/archives/000323.html.   After special handling for mail previously processed by SA that is now being in effect re-submitted for sa-learn, his .procmail script pipes the remaining incoming mail through SpamAssassin using “| /usr/bin/spamassassin –a”.  What does the –a option do?  I have RTFM and found lots of options, but nothing about “-a”.  I’m a real newbie, what am I missing?  Thanks.