Mailman and Postfix on Debian 9

Using postfix-to-mailman as a transport doesn’t seem to work in Debian 9 any more. Switching to aliases is quite straightforward. See https://stackoverflow.com/questions/27431010/postfix-mailman-recipient-address-rejected-user-unknown-in-local-recipient-tab I had to add the lists domain to mydestination. Calling /usr/lib/mailman/bin/genaliases is mentioned in the article above, but bears repeating because I may need that again.