Apple Mail – Change Default Sent Folder for IMAP Account

If Apple Mail didn’t automatically assign a correct folder on the IMAP server as its Sent folder, this can be easily fixed.

Simply select the correct folder in the folders pane on the left-hand side. Then from the menu select Mailbox > Use This Mailbox As > Sent Mailbox.

Apple Mail - Use This Mailbox As Sent Mailbox.