Hi!
It seems this did the trick
diff --git a/htdocs/wp/wp-content/plugins/email-subscribers/lite/includes/classes/class-es-handle-post-notification.php b/htdocs/wp/wp-content/plugins/email-subscribers/lite/includes/classes/class-es-handle-post-notification.php
index c064916..d9e9b73 100644
--- a/htdocs/wp/wp-content/plugins/email-subscribers/lite/includes/classes/class-es-handle-post-notification.php
+++ b/htdocs/wp/wp-content/plugins/email-subscribers/lite/includes/classes/class-es-handle-post-notification.php
@@ -260,6 +260,7 @@ class ES_Handle_Post_Notification {
// Get full post
$post_full = $post->post_content;
+ $post_full = do_blocks($post_full);
$post_full = wpautop( $post_full );
$es_templ_body = str_replace( '{{POSTFULL}}', $post_full, $es_templ_body );
