The Send Email Smart Service can send emails using a customer sender as long as an an email server has been set up.
To configure an email with a custom sender:
Enter a value for Sender Email. This value will be the sender's email.
Configure the rest of the Send Email Smart Service as needed. When a process kicks off this activity, the recipient would see an e-mail similar to the one below:
The information that's displayed to the recipient is dependent on the e-mail client being used.