The Configuration option allows you to specify the 'Sender' email address.
NOTE: This email address is the 'Reply' email address. When a recipient replies to an email sent from Communicator, it will go to this address. It is not the 'Sender' email address that appears on the emails. The sender email address that appears on emails is 'DoNotReply@sportingpulse.com'.
Related:
SWM Communicator - Manage Groups
SWM Communicator - Send Message