Hi @elsupercooldude,
Answering your questions:
1. It’s not possible to delete the Post Notifications sent history at the moment. At least not from the plugin side. You can remove them directly from your database if you’re comfortable doing it;
2. You can create a Welcome Email if you want to send a newsletter when someone’s subscribers;
3. You can send standard emails with any posts by adding the Post widget and manually send to your subscribers.
Let us know if you have any other questions and we will be happy to help you!
Thanks!