How many subscriptions can I have in a single FeedBlitz account?

There are no limits imposed by FeedBlitz. If you have many subscriptions, however, your ISP or mail server may impose quota limits on the inbound message or your account, and a daily digest from tens of different siites can become very large. If you start having delivery problems you should check for any quota limitations and consider changing some of your subscription schedules to reduce the size of each mailing.