This issue has been confirmed on 140.3.1esr (64-bit). When adding a new account via IMAPS/SMTPs connection, if it's the first time saving a draft or sending an email, the emails do not move to the Drafts or Sent Items folders as expected. Instead, they move to a newly created folder in the Local Folders. Furthermore, the special folder settings in the account configuration automatically change to point to the Local Folders instead of the connected IMAPs folder. Testing with Thunderbird 128.14.0esr did not reproduce this issue. I suspect this issue might stem from a mapping problem with Japanese folder names in the Japanese localization. (e.g., “下書き” as “Drafts”, ‘送信済みトレイ’ as “Sent”, etc...) Alternatively, could this be a change in behavior? Thank you for your assistance. Translated with DeepL.com (free version)