Thanks for the quick reply!
Does this mean that to install mailman 3 it will be necessary to do it with apt-get instead of as a component with Plesk? If so, is it possible to install it already or will it be in the future?
Thank you very much in advance.
I'm migrating from other Plesk on Ubuntu 16.04 and all is well except the fact my mailing list with mailman are not migrating. I investigate about this and I not find the module to install. How I can install the mailman on Plesk?, There are some problem?, are not suported now?