Yes, you can change the source e-mail address if you have enabled SendGrid integration. Refer to the link below for a detailed tutorial.
Note: You cannot change the e-mail address if you have not integrated SendGrid into Kuroco. SendGrid is free for usages up to 12,000 messages/month. Visit the official SendGrid website for more information.
Please also note that it is not possible to change only part of the address, such as in this format: