Contact
The developers can usually be reached on the IRC channel #mailman on Freenode.
Generally we recomend our students to discuss their ideas for a project on the public mailing list mailman-developers@python.org. However, if you feel you need a personal contact, see this user page: anna.granudd@gmail.com
You'll find more information about Mailman's GSoC projects and participation on Google Summer of Code 2011.