If you have multiple Google Accounts and don't remember which email address you used to create your Blogger blog just go to this URL :
Enter the URL of the blog you're trying to gain access to.
Follow the steps:
"testblog" change it with your blog name...
Step 2 :
Blogger will send an email with sign-in instructions to that email address
Done!!!
Source : bloggertipandtrick.blogspot.com
