#compdef mail mailx Mail mush zmail nail

local curcontext="$curcontext" state line expl suf

_arguments -C -s \
  '(-f -u)*-b[specify a BCC recipient]:BCC recipient:->userhost' \
  '(-f -u)*-c[specify a CC recipient]:CC recipient:->userhost' \
  '(-b -c -u -s *)-f+[specify mail folder]:mailbox:_mailboxes' \
  '(-f -u)-s+[specify a subject]:subject:' \
  "(-b -c -f -s *)-u+[read specified user's mail]:user:_users" \
  '(-f -u)*:recipient:->userhost' && return 0

if [[ "$state" = userhost ]]; then
  if compset -P '*@'; then
    _description hosts expl 'remote host name'
    _hosts "$expl[@]" && return 0
  else
    compset -S '@*' || suf='@'
    _description users expl 'login name'
    _users "$expl[@]" -q -S "$suf" && return 0
  fi
fi

return 1