If I wanted to customize the email sent to my subscribers can I change the email?
Is it 'new blog post' emails that you would like to customize? If so, go to 'Settings' and find 'Notifications you send'.
There next to 'Pre-installed notifications' you can find notification you send when new blog post is published. You can select the audience that you would like to notify, preview and edit the email.
Let me know if that's what you were looking for.