Ralf Hildebrandt writes:
How do I send an email to all list admins?
AFAIK, one by one, or you could make a mailing list for them. I guess you could save them one message by putting your announcement in the welcome message.
I think the original idea of the mailman@list.example.net list was to put the admins there. You'd have to do it by hand, and pretty much nobody seems to do that. I don't recall anybody asking for this before, although I'm pretty sure it occasionally comes up.
In Mailman 3 we could make a feature of this, but Mailman 2 is EOL, so it won't happen there. I'm not sure this is worth it since you'd need to configure all the options anyway (I'm not sure there are obvious defaults for a lot of them), so getting the list of lists is the least time-consuming part of the task.
In Mailman 3, perhaps we could make it easier to get the list of lists (or maybe the site admin can already get it in the top listinfo page).
Steve