Sieve not applied to mailbox when using imapsync

[marc+cyrusdev at milestonerdl.com]

I have a sieve script that is doing what I want it to do when I email
the account.

I'd like to have this script run when moving mail from one mailbox into 
the account with the script, but it is not doing that when I use 
imapsync program.

So.....what do I need to do to get the mail to pass through the sieve whe
when going to the new mailbox?