Verify that you are logging into your NetCommunity with your fully qualified domain name to create, make changes, and update emails created in NetCommunity.  Your fully qualified domain will be different from the cName of your site.  An example of the two are listed below.  

Fully Qualified Domain example: Blackbaud.com 
cName example: 132.bbnc.bbcust.com

If you are still experiencing issues please click Chat with Support and reference this article.