On Fri, 12 Dec 1997, Michael C. Berch wrote:
> The chief mischief of Bcc'ing a list, I think, is that it defeats users'
> attempts to filter their incoming mail using list names (etc.) in well-known
> headers. In order to stave off the need for the (IMHO ugly and annoying)
> subject-prefix for list message subject lines, I've told people that they
> shuld use a filtering program, and that the name of the list is guaranteed to
> appear in either the "To:" or "Cc:" headers.
That isn't good advice IMO; filtering on 'To' and 'Cc' will allow some
messages to slip through the filters (such as messages that are Bcc'd,
as you noted.)
Better advice is to pick a header that's known to be reliably present
in all messages (like Sender with Majordomo lists), then provide advice
on how to filter for that header, as done in:
(including advice on what software is capable of such filtering, and
what to do if you can't filter on Sender.)