Setting up a Sent Mail rule in Thunderbird
1. Click on Tools > Account Settings
2. Under your Account Name (the example below shows Work Account, you may have simply named yours IMAP), select
Copies and Folders
Make sure there is a tick next to Place a copy in: You then have TWO choices.
OPTION ONE
"Sent" folder on
By default Thunderbird selects "Sent" folder on This means that Thunderbird will create a folder for you called Sent under your IMAP account and all your sent items will filter into this folder.
OPTION TWO
Other You may already have a Sent Mail folder set up on your IMAP account. By selecting Other you can specify which folder you would like your sent mail to filter into. To select an alternative folder: Click on the following icon: Select your Account Name (not Local Folders) Choose the Sent Mail folder you require
Click OK to save your changes.