I have recently installed Thunderbird on a Raspberry-Pi - additional to several Windows PCs I'm using the same Mail-Adresses via Thunderbird - and on my MobilePhone - on serveral devices. This all works fine... But Thunderbird on the Pi has created two "SENT" Folders - one is named "Sent Items" - the other just "sent". Now - only the one folder named "Sent items" connects with the IMAP - the one named "Sent" only remains local - Mails sent from the PI DO NOT show up in the "Sent" folders on the other devices - all mails sent from other devices show up in the Folder "Sent Items". But the Mails sent from the Pi actually reach recipients and receive answers. The Location for the folders is listed under properties as: imap://[username]@imaps.[provider]/Sent (on the PI) - folder "Sent" imap://[username]@imaps.[provider]/Sent%20Items (on the PI) - folder "Sent Items" and imap://[username]@imaps.[provider]/Sent Items (under Windows) To solve the Problem, I tried to EDIT the line Location under properties, but this can't be edited (doesn't allow entries - or delete with cursor - nor pastes from Copy / Paste.) So how can I synchronize the SENT folder(s) from the Pi with the Server...? Thank you for any suggestions