When doing a contact search and using the action "Send email", a new draft mailing is created and a hidden group is assigned as recipients to the draft mailing. It is is displayed as "Search results" and has a different color.
If I click on the cross to remove it from the recipients, I get a message "This mailing was generated based on search results. The search results cannot be removed.". Why is that? I looked at the code where this restriction is enforced, but couldn't see anything that would suggest why search results cannot be deleted.