Email to Subscribers When New Post is posted

This is not an issue with Paid Memberships Pro – it is functionality handled either via a plugin like MailPoet using the MailPoet Add On or an Email Marketing RSS Feed campaign. These are provided by most third party email marketing solutions like MailChimp (which we use).

You’ll need to set up that campaigns in the third party and set up the add on for Paid Memberships Pro. See:
https://www.paidmembershipspro.com/add-ons/third-party-integration/

and

https://www.paidmembershipspro.com/2014/04/mailpoet-paid-memberships-pro-add/