On Tue, May 20, 2008 at 5:15 PM, Luis Lavena <luislavena / gmail.com> wrote:
> I haven't seen a way to get the ruby-core:XYZ number of reference of
> some mails (since I use GMail).

Doesn't the foolowing work? From the drop-down menu on the right
select "show original", and lookup header X-Mail-Count.
e.g.
X-Mail-Count: 16820

Then 16820 is the reference number.
For me it has always worked.

J.