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There is no option for manually editing the email field.
If a user has no email from ldap and the account is created with an empty email field; then there is no way to manually edit the account at as because drupal will complain of an empty email field. Since the only two options from ldap are to not show the email field or to disable the email field, there is nothing that can be done without editing the database.
Why does ldap obliterate any ability to manually change the email of an account instead of offering a third choice to leave the email field manually editable?