Error creating Email. The 'Default DNS Name' must be set in Service Center Serve

Error creating Email. The 'Default DNS Name' must be set in Service Center Serve

  

I used Send Email tool to send Mail
but it showing following error 
Error creating Email. The 'Default DNS Name' must be set in Service Center Server Configuration to send emails. 
Hi Poonam,

As the error says, you need to go in Service Center, in Administration tab -> Server Configuration
and set that field.

Regards,
João Rosado