[MlMt] Group Smart folders

[N C]

Dear all,

I would like to group a number of Smart Mailboxes under a single one for 
organisational purpose. Do you know any way to do so?

The scenario is:
I participate/follow in a large number of mailing lists across (at 
least) two different email addresses. In my current configuration, I 
created a smart mailboxes for each newsletter, but the number is quite 
large and I would like to group them somehow.


Any ideas?

Best,

Nicola