Automatic Email for a Blog Subscription/Follow

Hello,
is there any plugins or tool to send an automatic email to a reader?

Thanks!

The native form plugin can already perform this, see: https://learn.getgrav.org/forms/forms/reference-form-actions

What I meant, if I publish a new blog article, a plugins or the CMS shall send an email to my subscription list.

There isn't a plugin to do that, yet. You might also want to look at a feed-to-email automated service, similar to https://blogtrottr.com/ but there must be one for your specific need.