[MlMt] include contents of one smart mailbox in another

[Shoshanna Green]

Is it possible to set up a condition for smart mailbox A that will catch 
all messages that are in smart mailbox B, without just copying all the 
conditions for B over to A? Copying them over requires manually keeping 
the two sets of conditions identical; if I make a change to B I have to 
remember to make the same change to A.

In other words, I'd like to be able to have a condition on A that says 
"is included in B" along with the usual conditions like "is from 
such-and-such address," "is unread," etc.

(I believe that if B is a submailbox of A I can just check the box on 
A's Mailboxes tab that says "Include messages in any submailboxes of 
this mailbox"? But I'm wondering if there's a way to do it when B is not 
a submailbox of A.) (Also I find that checkbox a bit counterintuitive, 
since the mailboxes listed on that tab are the ones to which the 
conditions will be applied; listing them there doesn't mean that the 
messages in them will automatically be included whether or not the 
conditions match. But that seems to be what the checkbox means for 
submailboxes. The checkbox would be more intuitive to me on the 
Conditions tab.)

Thanks for any help!

Shoshanna Green
shoshannag at gmail.com