[Asiaplay]

First check the contents of the language tag "lbl_site_title" (that is the tag used in V4.1.11 - not sure if is 100% the same in V4.2.X) - perhaps that is what is being referenced in the e-mail templates. (i.e. change the text "value" in that language tag and see if fixes it - note default is that this tag's value is empty)

Otherwise, my guess is that you have to edit the e-mail templates - yes..

Cheers, Asiaplay