...
A general user list. Please post your questions to this list. Developers and members of the PMC monitor this list and answer questions as time permits. You must be subscribed to the list with the email address you use to post to it.
Note: before you submit a question to the mailing list, please thoroughly read the FrequentlyAskedQuestions list and other info on the FrontPage, as your question is likely already answered there. If you've looked carefully but still can't find your answer, then go ahead and post – but be sure to note
- how you're invoking SpamAssassin (options are in UsingSpamAssassin),
- what version of SpamAssassin you're using, and
- your platform.
Please don't ask questions about versions older than 2.64 and 3.0.0, as you don't want to use an old version for the same reason you wouldn't use an out-of-date anti-virus scanner.
- Subscription: send mail to users-subscribe at spamassassin.apache.org
- Unsubscribe: send mail to users-unsubscribe at spamassassin.apache.org
- Archives: Apache MarkMail GMANE MARC Nabble Gossamer
- Search: MarkMail GMANE Nabble Gossamer
- There is also a forum-style user interface for the list at Nabble.com, where you can post questions and get answers without subscribing by mailwith a 'NoMail' style subscription.
- For 'NoMail' style subscriptions (for GMANE, etc.): send mail to users-allow-subscribe at @spamassassin spamassassin.apache.org
http://gmane.org/plot-rate.php/plot.png?group=gmane.mail.spam.spamassassin.general&plot.png
...
For those involved in the development effort to discuss their work on the project. Unless you are working on a patch to SpamAssassin, this is probably not a list you need to use. If you're not already on the general users list, you should probably go there first 
You must be subscribed to the list with the email address you use to post to it.
- Subscription: send mail to dev-subscribe at spamassassin.apache.org
- Unsubscribe: send mail to dev-unsubscribe at spamassassin.apache.org
- Archives: Apache MarkMail GMANE MARC Nabble Gossamer
- Search: MarkMail Nabble Gossamer
- For 'NoMail' style subscriptions (for GMANE, etc.): send mail to dev-allow-subscribe at spamassassin.apache.org
http://gmane.org/plot-rate.php/plot.png?group=gmane.mail.spam.spamassassin.devel&plot.png
...