spam assassin is running on this server. It's on all of our hosting servers. I like it. Between that and spam sieve which is on my mac I almost never have spam in my in box. All 3 to 5 thousand a day go into the spam folder. That's a lot of spam.
Bill, it is written in perl, thus my assurance to you that if it is installed and running you have perl.
I do have a concern that it is sucking up that much memory. You'll want to look at that when you get a chance. Either it is an old version, the config file has something odd in it, or the bayes_seen is unrealistically large. And of course, if you aren't doing mail on that server then of course just shut it down. Something to think about when you have time.