Hi, I found these instructions, not sure if accurate or still applicable:
https://mail.python.org/pipermail/mailman-users/2007-April/056468.html
On Wed, May 9, 2018 at 9:28 AM, Martin Urbanec martin.urbanec@wikimedia.cz wrote:
If there is a way how to enforce manual adding by a list administrator, I'll be happy, but helping how to add whole aol.com to ban_list will be useful. I tried to add "^.*@aol.com$" (a regex) to the ban_list variable, but this apparently do not help, still some aol addresses are able to sign up.