It's not an option in the CP Sawg. You have to edit the html in the template somewhere. It's something like changing the default option to the no option, so <option default="true" tile="yes"> gets the default="true" moved the the no option.
That's a shite explanation but it's easy when you look at it. It's just some very basic html which I forget. You have the Search in the templates for 'Email Notification' to find the file your have to edit. Easy to work out when you see it.
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