Thank you for your response.
Messages don’t always get sent immediately. It depends which option the subscriber selected when he subscribed. The default selection is “Newspaper”-delivery, see here: https://www.screencast.com/t/b0MHggA2. If that is selected, the subscriber will receive only one email per day at a specified time (which the user can change of course). The purpose of this is that subscribers don’t get too many emails, but all messages of that day into one email, their “Newspaper”. If there is no new story for that day, of course no messages are sent.
Subscribers can also select to receive “Single emails” which means that messages are sent out as soon as we found them on your site (we screen your site roughly every 3-4 hours, if you’re a Premium user we’ll do it much more often, see https://www.specificfeeds.com/features-and-pricing).
As a publisher, you can also define what the default selection should be when people subscribe (on the “My Offered Feeds”-page when you’re logged into https://www.specificfeeds.com).