How can you program, or change the settings, so that you can send mails to your subscribers only once at 2, 3 or 7 days? By default, it will mail every day when you post something on your blog.
I honestly don't think there's any way to program your Feedburner this way because it's set to send them an email every time you update your blog. So, really no way of determining if this is possible. At least for me I wasn't able to find anything to figure this out.
This is not the right category for this question. You should transfer this question to http://forums.digitalpoint.com/forumdisplay.php?f=16. for getting the best answer.