I don't know anything about Ensim, but if it's even remotely Unix-y, you should be able to do an "altinstall" of Python 2.2.2 in /usr/local. E.g.: ./configure make make altinstall Then when you configure Mailman, use --with-python=/usr/local/bin/python2.2 Or stick with Mailman 2.0.13, which is compatible with Python 1.5.2. -Barry