In Brevo, I can ask the service to automatically generate a newsletter from the last WordPress post(s). It is a kind of automation that creates a message using a given template that has support for getting the RSS fields, subject, date, excerpt, etc,... I have been using this in Brevo for a decade, and in Mailchimp as well. Every week, I get my newsletter sent with my blog's latest updates. That could maybe also used for other kind of RSS files as well.

