email – Unable to find Sylpheed data storage location

Sylpheed stores its default data under ~ / Mail and indeed this folder exists and even contains empty subfolders such as inbox, sent, draft, etc.

However, I can not find any mail storage file even after downloading 800 messages from my IMAP mailbox. The messages are available offline, so it seems that they have been downloaded successfully.

Do you have any idea where I can find local storage?