Thank you for your post.
Is there a way to create a MSI/EXE which is truly silent, without any notifications (that it needs to generate an internet-ID or needs to send out an email etc)?
You can use the Standard or One-click options in the MSI Configurator
, those options produce msi and exe files respectively. You can run the msi file then with a "silent" key.
Note, however, that the installation won't be completely silent if you enable "Generate Internet ID" (even if you don't select "Send via email"). This is a security precaution used to protect the remote user's privacy. The Internet ID is a firewall bypass feature meaning that anyone who knows the ID and password can connect to that computer even from outside the local network, provided there is Internet access.
If you do not enable Internet ID, the installation can be silent.