I'm from Austria and my connection is a business adsl with now limits at the firewall of the ISP. The connection is online and all other things work (http-proxy, ...) At the moment i try to reboot the maschine, maybe it help to fix the problem.
I think i have noticed.
I get the email every hour, but the email has the false timezone.
The Email was sent from the maschine vor example at 10:48 and in the email stand 11:48.
The clock of the astaro-maschine is the right (10:48) and is sycronising the time with pool.ntp.org.
I think i will see it in an hour, if the restart has solved the problem.