Thank you for your input! We will consider this functionality in upcoming releases if it will be popular.
Everyone, please continue voting for this feature if you consider it important.
— rkRoman supported this idea ·Roman commented
As far as I'm informed it is currently not possible to secure the mailman Webinterface with multiple domain specific Certs. (e.g. on a shared server: list.domain1.tld, list.domain2.tld, ...).
Would it be possible to add this in the near future?