[MM3-users] Find all mailing lists a user is subscribed to

Hi,

I administer a Mailman 3 server with more than 50 mailing lists. All subscribers belong to the same organization.

Occasionally I need to answer questions such as: “Which mailing lists is user@example.com subscribed to?”

At the moment I iterate over every mailing list, list its members, and grep for the email address. It works, but it is inefficient.

Is there a supported way (CLI, REST API, or Postorius) to retrieve all the mailing lists a particular email address is subscribed to, without having to inspect every list individually? Rodolfo Pilas