Finally it got settled down with Feedburner. This service actually delivers new posts to email. This easy task didn’t seem to be executed by previously tried services.
Except for that feedburner also provides an overwhelming bunch of useful functionality like embedding interaction in feeds, gathering subscribers statistics, inserting subscribe links and such.
The only thing I slightly dislike is that Feedsmith plugin puts feedburner’s links in the feed to redirect to actual posts. This is probably to count statistics, and I see it as necessary evil.
Thumbs up, Feedburner. Google knew what it did when they acquired the service. Finally, Skalfa blog is equipped with what it needs for a more serious customer communication approach and all product blogs integration.