Say, campaign sending email address: firstname.lastname@example.org
If domain is verified then no need to verify email@example.com
but if you still have the email address in the verified list please remove it from the verified list.
Multiple IEM instance - send campaign using different email address under the same domain.
firstname.lastname@example.org on first instance
email@example.com on second instance.
Then please inform us during purchase or first installation. We have solution for this situation.