Having the "from" address the same as the "to" address, often resulted in issues on mail servers. Some mail servers have policies set that do not allow external emails to come from an internal server address. Other times, mail servers will treat these sorts of a mails as junk or span and not direct them to the inbox. Further, it just looked weird!
Now, Apex 4.2 allows you to explicitly set the "from" address either at the instance level, or at the report level itself.
Navigate to a page that has an interactive report, and view the Report Attributes. Scroll down to Advanced Attributes. Here, you can specify the "Email From Address":
You can also set the from address at the application level. In Application Builder, edit and application and click the Edit Application Properties button. Scroll down to the Properties section, here you will find a property where you can special the application's "from emal address."
Sometimes it is just the little things that make a big difference!