Sorry just found the “Subscribe all to feed by mail” button in the subscribers section. So all good with that.
But a new question came up. I have 1701 emails stored. My confirmed emails are 1698. When I Subscribe everyone to the feed via the button it only puts 1649 of those mails in the list. What could be the meaning of this?
Also as mentioned in the first post is it ok for Newsletter Pro if I upgrade to WordPress 3.6 or are there any issues?