ListservManager no longer part of James?

Hi there, Matt here.

So, I wanted to set up a small mailing list a for a small project, found 
the doc about 2.3 and 3.x - but then didn't found the 
AvalonListserverManager but only the two matchers CommandForListserv and 
CommandListservMatcher. I also tried to look back at earlier git commits 
but couldn't find any either.
Was the support for mailing lists dropped at some point?
I'm sure I may could implement my list manager, either as Matcher/Mailet 
or as an imap/smtp client, but would be nice to use something existing - 
or least get some ideas from it.

Thanks in advance,

Matt