I think that the docu to $wgEmailAuthentication was wrong so I changed
it . I have a wiki which was switched to "false" as a setting and I
still get notifications since the respective user preference options for
email notifications are selected on special page "Preferences". I want
to make sure that the docu is correct.
Moreover all the related configuration parameters like e.g.
$wgEnotifUserTalk state that they are being ignored if the setting to
$wgEmailAuthentication is "false". I guess these need to be changed too?
Alternatively it may be the case that the selection of a user via
special page Preferences for the respective preference options override
whatever one set via the respective configuration parameters. This would
have to be noted too.
I would like to sort this out properly. Thanks for your insights.
PS I believe that it makes sense to send notifications to emails if
provided even if they were not authenticated in a second step. Probably
you would not like to have this on a public wiki with high activity but
this is another story.