It would be great if the email-extension plugin could send emails for every broken build, but only to the persons that broke the build in the first place.

Lets assume that person A breaks the build with commit 1. Then person B and C push commits 2 and 3. All three commits fail because of the first commit. Right now, A gets 3 mails for broken builds and B and C get 2 and 1 mail, respectively, even though B and C didn't break anything. It would be better if A gets all three mails and B and C don't get any emails until the build is stable again.