Yes, but there are many plugins that sends bulk mails to registered users and people who commented. (Search for “newsletter” tag and you will see).
Also I can extract the mails from the database if I wish to do something bad.
All I want is that instead of sending to everyone, only choose one entry in my blog.
(If you speak spanish, go to my profile then to my blog and read the only entry with more than 400 comments and you will find that is not a “bad thing” what i want to do)
Regards.