Testing my email sending one more time before inviting my users on.
I found the subscribe by email works great on the main site. The sub sites are a different story. I added a post in a sub site and it did not notify. I checked the subscription list and there were no users. I added the emails that I want and they did not appear in the list.
I checked the db and main site, they are there. They would not appear or notify in the sub sites.
The plug in is activated on a per site basis as recommended.
Thanks for your help.