Here are a few patches where I opted to clean up code rather than
marking parameters with UNUSED. Plus a bonus cleanup in patch 3 (though
I am also OK to drop that one; I don't care much about the imap-send
code, and I'd be just as happy if we deprecated and eventually dropped
the tool).

  [1/3]: imap-send: use server conf argument in setup_curl()
  [2/3]: imap-send: drop unused parameter from imap_cmd_cb callback
  [3/3]: imap-send: drop unused fields from imap_cmd_cb

 imap-send.c | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

-Peff