Redisplay error message on settings page

Currently, on install/enable a list of invalid emails is displayed, eg

I believe there is a settings page (see https://github.com/JMAConsulting/biz.jmaconsulting.ode/issues/23) that allows one to choose to allow FROM email address (civicrm/admin/options/from_email_address?reset=1) to be valid in addition to the Org email provided at civicrm/admin/domain?action=update&reset=1. Please redisplay the errors when that page is visited, and document that page in the README.md.