A.1 Setting the default emacs mail program

emacs allows you to select an e-mail program as the default program it uses when you press C-x m (compose-mail), call report-emacs-bug and so on. If you want to use mu4e for this, you do so by adding the following to your configuration:

(setq mail-user-agent 'mu4e-user-agent)

At the present time, support is experimental.