On Fri, May 11, 2018 at 12:30 AM Dhaval S. Vyas <dsvyas@gmail.com> wrote:
Many of you would have noticed that now we have started getting additional subscriptions from email addresses with yahoo.com domain, while aol.com continues.

I have also seen suspicious-looking google.com adresses (same account multiple times with garbage added after the + mark), might be coincidence though.

I haven't seen any spam in the last 2-3 hours since setting a subscription filter for aol+yahoo (note that some of the existing filter rules might be invalid, in which case mailman will refuse to save any changes to the filter and the error message about that is microscopic), and that's a less disruptive solution than disabling subscription altogether.