Error:
E-mail to owner could not be sent.
Reason:
You will get this error, when you are trying to send "Request Access" in SharePoint 2010. Because, the system could not send request to the specific portal administrator, since the email address of the portal administrator may be wrong or empty.
Solution:
1. Go to the "Site Actions" --> "Site Permissions" as per the below image.
2. Click on the "Manage Access Rights" option in the Ribbon Menu.
3. Provide the correct and valid email-id in the pop-up.
4. Now, you will be able to send request successfully and the success message will be displayed like below:
Thats it...
