(add-hook 'gnus-summary-prepare-hook 'gnus-summary-sort-by-most-recent-date)
(setq gnus-select-method '(nnnil ""))
(add-to-list 'gnus-secondary-select-methods
             '(nnimap "mailbox"
                      (nnimap-address "imap.mailbox.org")
                      (nnimap-server-port 143)
                      (nnimap-stream starttls)))