We use Imap client RoundCube. This third-party system accesses the mail files. I find Imap client's sorting and threading are disable, then I telent to imap mail server and find IMAP server don't supports server-side sorting and threading.
I want to know that how to setting then Imap Sever can support server-side sorting and threading.
Domino server version: 9.0.1 FP3 Server OS: Windows 2012.
Pls help to refer the below ideas: