This actions sends an email through SharePoints outgoing email service.

1. To - specify user or column as recipient. Column must be of Person type or contain an email address.
2. Cc - specify user or column as CC recipient.
3. Bcc - specify user or column as CC recipient. 
4. Subject - use value picker to create a subject.
5. Body - use value picker to create an email body. The body multi-line text can be formatted by using HTML tags to define how you want the body of the text to appear.

NOTE: You can only send within your organization. Email addresses belonging to any other domain will be automatically removed and discarded.