Hello. I read the RFCs and documents I can find on the internet, it seems it's not possible for sieve to flag a thread. I need such an action that not only setflag the current email, but also any other emails in the same thread in the folder. This is useful to organize workflow in our business, each workflow is a discussion thread and if someone send an email to this thread with subject "Done", the whole thread should be flagged or moved to another folder. Being able to setflag (or move messages) for a whole thread of discussion is vital to use sieve to help us organize email, otherwise we probably wouldn't put as much information in email and try develop a web application on our own. Can this be done? Help really appreciated. Best regards Zhang Weiwu ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html