How to monitor the sent folder and trash folder?

In the inbound email setting, I have selected the trash folder and the sent folder. But I can not find out them in SuiteCRM email module, I can only find out the Inbox folder.

Somebody also encountered the same problem, and the one guy said he has solved. But I can’t see his solutions. Because the picture displayed error.

Here is the link:

https://suitecrm.com/forum/suitecrm-7-0-discussion/1095-email-folder-sent-trash#21582

Anybody could tell me the solution? Thanks!