The Metasploit development mailing list used to be hosted on SourceForge, but is now on Google Groups. Metasploit Hackers is dead, long live [Metasploit Hackers][list]. (Or [mailto:Metasploit Hackers][mailto]).
Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to msfdev@metasploit.com which goes to all the current committers. If the incident involves a committer, you may report directly to caitlin_condon@rapid7.com or todb@metasploit.com.