Mailing Lists
We generally discuss SpamAssassin and its development via the following mailing lists. Where available, there is a graph which shows you how much mail you should expect to hit your inbox if you subscribe.
Announce
For announcements of new versions of SpamAssassin.
- Subscription: send mail to announce-subscribe at spamassassin.apache.org
- Archives: Apache MARC Nabble Gossamer MarkMail
http://gmane.org/plot-rate.php/plot.png?group=gmane.mail.spam.spamassassin.announce&plot.png
Users
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.
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versions older than 2.64 and 3.0.0, as you don't want to use an old version for the same reason you wouldn't use an out-of-date anti-virus scanner.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 mail.
- For 'NoMail' style subscriptions (for GMANE, etc.): send mail to users-allow-subscribe at @spamassassin.apache.org
http://gmane.org/plot-rate.php/plot.png?group=gmane.mail.spam.spamassassin.general&plot.png
Dev
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 
- 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
http://gmane.org/plot-rate.php/plot.png?group=gmane.mail.spam.spamassassin.devel&plot.png
Commits
For SVN and Wiki change messages. If you don't know what they are, you don't want to be on this list, and if you're not already on SpamAssassin-users, you should probably go there first
- Subscription: send mail to commits-subscribe at spamassassin.apache.org
- Unsubscribe: send mail to commits-unsubscribe at spamassassin.apache.org
- Archives: Apache MarkMail GMANE Gossamer
- Search: MarkMail Gossamer
http://gmane.org/plot-rate.php/plot.png?group=gmane.mail.spam.spamassassin.cvs&plot.png
Dev-DE
A list for German-language rule development. Not very active currently.
- Subscription: send mail to dev-de-subscribe at spamassassin.apache.org
- Unsubscribe: send mail to dev-de-unsubscribe at spamassassin.apache.org
- Archives: Apache MarkMail MARC GMANE
http://gmane.org/plot-rate.php/plot.png?group=gmane.mail.spam.spamassassin.devel.german&plot.png
Dev-BR
A list for Brazilian rule development.
Security Issues
We treat security-related issues specially. If you believe you have discovered a security issue related to SpamAssassin, please send a mail to security at spamassassin.apache.org with full details.
Private Lists
The project management committee maintains a private list, used for a very limited subset of discussions that cannot take place in public. This is not open for public subscription, but is documented here for completeness and transparency. See ProjectRoles for more details on what this list is used for.
Search Across Lists
You can also search and browse a unified view of all SpamAssassin mailing lists.
Other Ways of Communication
IRC is also an option.