Let's say a mail account (IMAP) is installed on Thunderbird on two computers (A and B). I made a local folder (SENT_MAILS) on each computer and I want every sent mail to be copied there, regardless of the original sender (A or B). More specific: user A sends an email, the mail is stored on IMAP sent folder, user B can see this email on their IMAP sent folder. BUT, what I want is user B to has this email on their local folder SENT_MAILS also. I created a filter on both Thunderbirds, that copies every sent mail on the local SENT_MAILS folder, but in that way each USER has on their SENT_MAILS only the emails that have been sent from their own Thunderbird. What I am trying to do is having a local and total backup of sent mails on every pc, so be able to delete whatever from IMAP sent folder if it needs to.