June 3, 2014
10:33 p.m.
At least the "current" release of v11.44, as of last week.
cPanel v11.42 is still on Mailman 2.1.17.
https://documentation.cpanel.net/display/ALD/11.44+Change+Log https://documentation.cpanel.net/display/ALD/11.42+Change+Log