Requests created via widgets are registered to Created by com.atlassian.servicedesk.embedded
The notification emails that the end users receive show the sender as com.atlassian.servicedesk.embedded - this too is potentially problematic for some email system that are expecting email notifications to come from a specific email address and name, such as a the email address that sent the message.
Set the creator as reporter instead
Or provide an option to allow a JSD admin to set the value of the sender for these messages.
As the creator is set as com.atlassian.servicedesk.embedded, the From address of the notification will be sent from com.atlassian.servicedesk.embedded