No, the list is not fine. It should set the Precendence level. Your method
would automatically assume that anyone who BCC'ed you was a mailing list.
That's OK - I don't want to send vacation mail to folks that BBC
Useful rules (taken from 'man vacation'):
No message will be sent unless login (or an alias supplied
using the -a option) is part of either the ``To:'' or ``Cc:''
headers of the mail. No messages from ``???-REQUEST'',
``Postmaster'', ``UUCP'', ``MAILER'', or ``MAILER-DAEMON''
will be replied to (where these strings are case insensitive)
nor is a notification sent if a ``Precedence: bulk'' or
``Precedence: junk'' line is included in the mail headers.
Anyhow, enough non-operation junk for now.
--firstname.lastname@example.org (Andrew Partan)