Re: Lack of notification of security notices

> Clearly, something has failed. The archives show no messages to...

Do they show up here...

rsync -nHaxi bit0.us-west.freebsd.org::FreeBSD-mailarchive/

That is supposed to be the ultimate raw history archive of
all freebsd mail since forever, or at least should be such
a sort of independent delivery copy.
Try importing the raw mboxes in question to search
for the messages in question.

> how the mailer treats cross-posts.

Bcc's should also be enabled to deliver and show up,
Bcc as reduced form of Cc still helps with inclusion,
and also helps keep 'group / all' replies going to primary.