Change email for update notification

The setting you are looking for is found in “Settings”=>”General”=>”E-Mail Adress”.

All the Emails WordPress or Plugins send out are sent to the admin_mail, which is returned by get_option( 'admin_mail' ), and this Emailadress is not always connected to a user.

If you first install WordPress, the first user created gets the role administrator, and the same Emailadress is used for this setting, but can be changed afterwards.

This actually makes a lot of sense, as a site could have a few administrators (or none, to be picky). Not everybody needs to get this information, as well as someone should get it, even if a site does not have an administrator registered in the database.

This is the reason for the two distinctive fields/settings.