[Mailman-Users] List email pre-approval

[Steve Sterling]

With Majordomo, you could pre-approve a message to the list, say from an
otherwise unsubscribed user or to a moderated list.

I tried with my mailman, but it treats the Approved: <password> first line
as normal message body. Somewhere, I remember seeing that Mailman supports
such things, but can't find any documentation on syntax, etc.

Can anyone point me the right direction, or is that not a feature?

Steve