Error Approving Email: Sending IP is Empty or Not Valid

Issue:

When I try to approve an email I get the following error:

Error approving Email Name - Sending IP is empty or not valid

Solution:

You likely have multiple dedicated IPs and you did not choose which one to send this email from.

1. Edit Draft of the email in question.

2. Select which IP Address you want this email to sent from and click Save.

3. Close the email editor and under Email Actions click on Approve.