Registration Widget EmailSenderName property

How can you set a different 'EmailSenderName' value opposed to the default 'noreply@noreply.com'. I've followed this thread

www.sitefinity.com/.../registration-widget 
and come to the same error. 

The current type, Telerik.Sitefinity.Web.Mail.IEmailSender, is an
interface and cannot be constructed. Are you missing a type mapping?

I've modified the 'EmailSenderName' property in the Registration Widget's 'advanced' properties tab (and get the error). I've cleared that out and followed the instructions in the thread to create a new 'successfulRegistrationEmailAddress' parameter to my membership provider -- still the same error. 
I've also confirmed that my SMTP settings are correct as well; no effect.

What am I missing here??

Hi Rico,

Usually, following this KB should be enough to change the noreply email:

http://www.sitefinity.com/developer-network/knowledge-base/emails-with-invalid-sender-email-address-are-blocked-by-servers

Are you using any custom registration controls or by any chance instantiating an onbect of type IEmailSender in your code? If this is the case I would advise you to open support tickets and send us your implementation.
 
All the best,
Jen Peleva
the Telerik team