The "Users send e-mail via board" option in the ACP determines whether the plaintext email address is displayed or whether an email form is used instead. In order to see either, a user needs to have the sendmail permission. There is no warning on the registration page or anywhere else (as far as I can see) that email addresses might be displayed to other members.
By default, "Users send e-mail via board" is disabled (so addresses are displayed in plaintext), but Registered Users do not have the sendmail permission, so nobody can see the addresses anyway. If an administrator gives this permission to the Registered Users at some point, all email addresses on the board become visible to everyone else unless the "Users send e-mail via board" option is also toggled.
1) Should "Users send e-mail via board" be enabled by default if emailing is available?
2) Should users be warned that their email address may be displayed to others (perhaps as clarification of the "Users can contact me by e-mail" account preference)?
