Hi Linda,
Thanks for bringing this to our attention.
This was an intentional change made for privacy reasons, as there is no verification process for public contact emails on Blogger. That being said, after hearing your feedback I am adding a new (very similar) feature which will set a "reply to" address in the email, so that when you reply to the email it will send it to the commenting user's contact email address. It should be working for you again in the next 2-3 business days.
Thanks,
Jonn