If you see messages like this:

{{spamd\[3279\]: prefork: server reached \-\-max-clients setting, consider raising it}}

You'll probably try raising the --max-clients setting, only to find that that switch does not exist. This was a typo; the correct settting is called --max-children.

See this mail from Matt Kettler for more details.

This bug was fixed in SA 3.1.1.