The reason behind adding this new functionality was to have access to all emails sent out from/to Sales Panel Message of the section 'Requests/Quotes', in folders of the user's email mailbox (Inbox/Outbox).
In a section Settings, we have added a new panel Mailboxes. Enter this panel and click at the bottom of the page - a new window will show up for 'Mailbox' configuration, which needs to be filed in with details, such as:
Before saving Mailbox settings, loading folders must be done - click icon and Leon will show a drop-down box Outbox, where all folders of the pre-defined email account will show and 1 outbox folder must be selected. In the Inbox field, it's possible to select more than 1 inbox folder. It is also possible to include 'Subfolders' into the configuration - Leon then will search for emails ot only in folders but also in inbox subfolders.