Here are described the following variables.
Draft mode evaluates `text-mode-hook' and `mew-draft-mode-hook' in order. If you don't set `auto-fill-mode' to `text-mode-hook', It would be useful to define `mew-draft-mode-hook' as follows:
(setq mew-draft-mode-hook (function (lambda () (auto-fill-mode 1))))
You may want to use another address than which your Email manager defined. An example is the case that a host name appears in your Email address since the configuration by your Email manager is imperfect. (In this case, ask him to resolve this problem first.) If From: is specified on a draft, Mew treats it as it is. You can specify From: with completion. If you want to prepare From: in drafts, set `mew-from' as follows:
(setq mew-from "Kazu Yamamoto <Kazu@Mew.org>")
This feature means that you cannot trust From: in all cases. I would sincerely ask all Mew users NOT to cheat others with this feature. And please note that a bad guy can set himself up as another guy very easily. For important messages, use PGP/MIME.
If you want to back up your messages every time when you write them with Fcc:, put the following line into ".emacs".
(setq mew-fcc "+Backup")
Define `mew-cc'(`mew-dcc') to use Cc:(Dcc:).
If you want to use Mew with full Emacs frame, set like this.
(setq mew-window-use-full t)
`SPC' in Summary mode decide the next action to view a message according to `mew-summary-show-direction'. Likewise, you can specify the cursor direction after putting a strong mark by `mew-summary-mark-direction'. You can select one from the following candidates.
The default value for both is `next'. If you read messages from the bottom, set as follows:
(setq mew-summary-show-direction 'up)