I facing this problem quite some time, but still cannot figure out where the problem come from. I am using the template which build in Email Subscriptions box, and allow me to key in my feed id and detail at WP back end such as but when I try to subscribe 1 email over my template, after hit enter, it pop up the 1 new windows, normally for us to key in some verification, but it show "The feed does not have subscriptions by email enabled" I check over my feedburner setting, I have enable/active the "Email Subscriptions"