I appreciate your efforts to help here. It's not the cron function. We use scheduled posts all the time. Plus, even the confirmation email when someone subscribes to the daily digest is not sending, which is not a timed function.
Here's more info for you to consider.
I use a dedicated server on Bluehost. I am using the Atahualpa theme. I have been on the phone with Bluehost tech support three times about this. They have spent a great deal of time looking into it, and they do not believe it has anything to do with the server settings. They think there is something wrong with the form, that despite taking the new subscriber to the thank-you page, it does not actually call into action the confirmation email. I told them, well what about the fact that the digest itself is ALSO not sending to the addresses I have manually subscribed? That indicates the problem is bigger than the form, or else there are two problems.
Your plugin has over a million downloads. I have read everything, tried everything. I am a good web designer who understands a moderate amount of php. I have been using wordpress for seven years. I keep my sites clean an dupdated. It makes no sense that I cannot get this plugin working.
The client I made this site for is willing to pay to resolve this issue. They get over 5,000 visitors a day to the site. It's a daily news site. How much would it cost for you to go into the site and fix it yourself for me?