Precedence: junk vs. bulk? Misbehaving RH mailing list?

[Eric Wood]

Some RH mailing lists (including this one) has "Precedence: junk" instead of
the traditional "Precedence: bulk" in the email headers.  Vacation
autoresponders will likely reply to such lists since they don't see "bulk".

Most other mail lists that I'm on (including the LKML) has "Precedence:
bulk".  Is there a mail gateway that's changing the "Precedence:" tag?

-eric wood