If the end user de-selects the 'Contact' button, but tries to email the comment to an 'Additional To' or 'BCC' the system returns an error message because it's a public comment and the Contact is not selected.  It does not return an error if the Contact is de-selected but no additional 'To' or BCC is included. I understand there is a work-around to create a fake contact that is included on all emails, but we do not want to include an 'extra' contact on all emails to customers.  If the comment is public, we would like the email/comment to go to the Contact with no option for the end user to de-select.  The 'scenario' we've encountered the error is when an end user is trying to 'communicate' to someone other than the contact - so they want it public, and to generate an email to someone other than the contact.  This returns the error.  We would just like the contact to always be required, so an option to not allow it to be de-selected.