[liraz]

Not true. If you cut down the number of preforked processes and use spamd spamassassin works just fine in a VPS with limited memory.

Also, SA leverages blacklist services (and other techniques, it's very configurable) and is easier to integrate into your mail server.

[lazyant]

SA is easy to integrate in a mail server but not "easier" than adding one line to the server configuration. SA lets many spam go through, it's a pain in the neck to fine-tune it and when you have a lot of spam coming in it uses a lot of CPU for parsing. With blacklist servers spam is dropped at the beginning, there's no further parsing etc.

Basically I don't know why anyone nowadays would use spamassassin (I've used it in the past) when there's graylisting and blacklist servers that work wonderfully with low overhead.