[kronolith] Shared calender and event notification email address

[Samuel Wolf]

Hello,

we have some shared calenders and I add following to our prefs.local.php
$_prefs['event_notification']['value'] = 'show';

If a user add a event everybody receive a email, everything fine. But
what I do not understand, some receive the email with "From: User1"
and some with "From: User3" and so one.

Where I can set the sender of the event notification?
And why everyone can see all the recipients?

Samuel