Hi all, I've tried a lot of combination but I was totally unable to solve a simple problem which I'm going to explain, I've also thought about a workaround which is quite dirty but I'll need assistance with that too: ************** Problem *************** Suppose you have a mail address which might be used in "To:" or "CC:", for clarity, let's call it "Alpha". ************** Issues with filters *************** It might happens "Alpha" is being used as the ONLY address for "To: or CC". I'd like to create a filter rule for ONLY this kind of situation (I want to move all these mail to a folder called ALPHA - ONLY). I've tried many combinations of filters but in the end they only checks whether alpha is one of the addresses: I'm talking about rules: "IS"; "Begins with" used together with "Ends with"; "is not in AddressBook" '''I already have a folder called "Alpha-Related" where all the mails where "Alpha" is contained are redirected. The folder "Alpha-Only" will have to be subset of "Alpha-Related"''' It seems to me this is not possible at all. Am I missing an option? could you please help? ************** My workaround idea *************** Use a script to move the mails from a folder to another. Unfortunately I'm not competent on how thunderbird stores it's content and what I should mess with and how. I've reached my account email folder in my local machine (the one inside Thunderbird's profile folder) but at in the end I'm stuck with 2 kind of files which are called like my folder: # one without any extension; # one with extension ".msf"; By heart I understand I need to move some content of 1 to 2, I might experiment usind diffs for the files, but still I don't know if it is all I need to do or if instead there is more to do Could you please assist ?