Schleuder will create the list gpg key together with the list. Please not that the created keys do not expires. For more information about how Schlueder creates keys you can check: https://0xacab.org/schleuder/schleuder/blob/master/lib/schleuder/list_builder.rb#L120
To export a list public key you can do the following:
To export a list public key you can do the following: