partially solved (or solved but i have a question/doub), but a question:
why sais that represent "will still put some load on the server"?
after check of course various "IMAP_CAPABILITY" directives in config file
"imapd" found that paragraph:
##NAME: IMAP_DISABLETHREADSORT:0
#
# Set IMAP_DISABLET
i installed the roundcube 1.2.9 and when try to get threat sort got that
message:
Server error: UID THREAD: This command is disabled by the system
administrator.
but same insterface works well in older server .. the new version of the
courier (debian strech) seems are big different from older one
